Ultimate Member: Redirección después del registro

He estado leyendo varios hilos sobre la redirección después del registro con respecto al plugin Ultimate Member y he probado algunas soluciones pero no han funcionado.

Las redirecciones de login y logout funcionan bien y como se espera, pero la de registro parece tener un pequeño error, ya que después de establecer una URL de redirección, por ejemplo www.example.com, la URL de redirección se convierte en www.example.com/register/www.example.com

Tengo poco conocimiento de PHP y creo que podría ser un error en el código del plugin.

Gracias de antemano.

edit:

<?php

/**
 * Cuenta aprobada automáticamente
 */
add_action('um_post_registration_approved_hook', 'um_post_registration_approved_hook', 10, 2);
function um_post_registration_approved_hook($user_id, $args){
    global $ultimatemember;

    um_fetch_user( $user_id );

    $ultimatemember->user->approve();
}

/**
 * Cuenta necesita validación por email
 */
add_action('um_post_registration_checkmail_hook', 'um_post_registration_checkmail_hook', 10, 2);
function um_post_registration_checkmail_hook($user_id, $args){
    global $ultimatemember;

    um_fetch_user( $user_id );

    $ultimatemember->user->email_pending();
}

/**
 * Cuenta necesita revisión del administrador
 */
add_action('um_post_registration_pending_hook', 'um_post_registration_pending_hook', 10, 2);
function um_post_registration_pending_hook($user_id, $args){
    global $ultimatemember;

    um_fetch_user( $user_id );

    $ultimatemember->user->pending();

}

/**
 * Añadir usuario a WordPress
 */
add_action('um_add_user_frontend', 'um_add_user_frontend', 10);
function um_add_user_frontend($args){
    global $ultimatemember;

    unset( $args['user_id'] );

    extract($args);


    if ( isset( $username ) && !isset($args['user_login']) ) {
        $user_login = $username;
    }

    if ( ! empty( $first_name ) &&  ! empty( $last_name ) && ! isset( $user_login ) ) {

        if ( um_get_option('permalink_base') == 'name' ) {
            $user_login = rawurlencode( strtolower( str_replace(" ",".",$first_name." ".$last_name ) ) );
        }else if ( um_get_option('permalink_base') == 'name_dash' ) {
            $user_login = rawurlencode( strtolower( str_replace(" ","-",$first_name." ".$last_name ) ) );
        }else if ( um_get_option('permalink_base') == 'name_plus' ) {
            $user_login = strtolower( str_replace(" ","+",$first_name." ".$last_name ) );
        }else{
            $user_login = strtolower( str_replace(" ","",$first_name." ".$last_name ) );
        }

        // si el nombre completo existe
        $count = 1;
        while( username_exists( $user_login ) ) {
            $user_login .= $count;
            $count++;
        }
    }

    if( !isset( $user_login ) && isset( $user_email ) && $user_email )
    {
        $user_login = $user_email;
    }

    $unique_userID = $ultimatemember->query->count_users() + 1;

    if ( ! isset( $user_login ) ||  strlen( $user_login ) > 30 && ! is_email( $user_login ) ) {
        $user_login = 'user' . $unique_userID;
    }

    if ( isset( $username ) && is_email( $username ) ) {
        $user_email = $username;
    }

    if ( ! isset( $user_password ) ){
        $user_password = $ultimatemember->validation->generate( 8 );
    }


    if( ! isset( $user_email ) ) {
        $site_url = @$_SERVER['SERVER_NAME'];
        $user_email = 'nobody' . $unique_userID . '@' . $site_url;
        $user_email = apply_filters("um_user_register_submitted__email", $user_email );
    }


    $creds['user_login'] = $user_login;
    $creds['user_password'] = $user_password;
    $creds['user_email'] = trim( $user_email );

    $args = apply_filters('um_add_user_frontend_submitted', $args );

    $args['submitted'] = array_merge( $args['submitted'], $creds);
    $args = array_merge($args, $creds);

    unset( $args['user_id'] );


    do_action('um_before_new_user_register', $args);

    $user_id = wp_create_user( $user_login, $user_password, $user_email );

    do_action('um_after_new_user_register', $user_id, $args);

    return $user_id;
}

/**
 * Después de añadir un nuevo usuario
 */
add_action('um_after_new_user_register', 'um_after_new_user_register', 10, 2);
function um_after_new_user_register( $user_id, $args ){
    global $ultimatemember, $pagenow;
    extract( $args );

    um_fetch_user( $user_id );

    if ( !isset( $args['role'] ) ) {
        $role = um_get_option('default_role');
    }

    if ( $pagenow != 'user-new.php' && !array_key_exists( $role, $ultimatemember->query->get_roles( false, array('admin') ) ) ) {
        $role = um_get_option('default_role');
    }

    $ultimatemember->user->set_role( $role );

    $ultimatemember->user->set_registration_details( $args['submitted'] );

    $ultimatemember->user->set_last_login();

    do_action('um_new_user_registration_plain');

    do_action('um_post_registration_save', $user_id, $args);

    do_action('um_post_registration_listener', $user_id, $args);

    do_action('um_update_profile_full_name', $args );

    do_action('um_post_registration', $user_id, $args);

    if( ! is_admin() ){
        do_action('user_register', $user_id );
    }

}

/**
 * Actualizar perfil del usuario después del registro
 */
add_action('um_post_registration_save', 'um_post_registration_save', 10, 2);
function um_post_registration_save( $user_id, $args ){
    global $ultimatemember;

    unset( $args['user_id'] );
    $args['_user_id'] = $user_id;
    $args['is_signup'] = 1;

    do_action('um_user_edit_profile', $args);

}

/**
 * Listener de administración post-registro
 */
add_action('um_post_registration_listener', 'um_post_registration_listener', 10, 2);
function um_post_registration_listener( $user_id, $args ){
    global $ultimatemember;

    if ( um_user('status') != 'pending' ) {
        $ultimatemember->mail->send( um_admin_email(), 'notification_new_user', array('admin' => true ) );
    } else {
        $ultimatemember->mail->send( um_admin_email(), 'notification_review', array('admin' => true ) );
    }

}

/**
 * Procedimiento post-registro
 */
add_action('um_post_registration', 'um_post_registration', 10, 2);
function um_post_registration( $user_id, $args ){
    global $ultimatemember;
    unset(  $args['user_id'] );
    extract($args);

    $status = um_user('status');

    do_action("um_post_registration_global_hook", $user_id, $args);

    do_action("um_post_registration_{$status}_hook", $user_id, $args);

    if ( !is_admin() ) {

        do_action("track_{$status}_user_registration");

        // Redirección prioritaria
        if ( isset( $args['redirect_to'] ) ) {
            exit( wp_redirect(  urldecode( $args['redirect_to'] ) ) );
        }

        if ( $status == 'approved' ) {

            $ultimatemember->user->auto_login( $user_id );
            $ultimatemember->permalinks->profile_url( true );

            do_action('um_registration_after_auto_login', $user_id );

            if ( um_user('auto_approve_act') == 'redirect_url' && um_user('auto_approve_url') !== '' ){
                exit( wp_redirect( um_user('auto_approve_url') ) );
            }
            if ( um_user('auto_approve_act') == 'redirect_profile' ){
                exit( wp_redirect( um_user_profile_url() ) );
            }

        }

        if ( $status != 'approved' ) {

            if ( um_user( $status . '_action' ) == 'redirect_url' && um_user( $status . '_url' ) != '' ) {
                exit( wp_redirect( um_user( $status . '_url' ) ) );
            }

            if ( um_user( $status . '_action' ) == 'show_message' && um_user( $status . '_message' ) != '' ) {

                $role_id = $ultimatemember->user->get_role_name( um_user('role'), true );
                $url  = $ultimatemember->permalinks->get_current_url();
                $url  = add_query_arg( 'message', esc_attr( $status ), $url );
                $url  = add_query_arg( 'um_role', esc_attr( $role_id ), $url );
                $url  = add_query_arg( 'um_form_id', esc_attr( $form_id ), $url );

                exit( wp_redirect( $url ) );
            }

        }

    }

}

/**
 * Nuevo registro de usuario
 */
add_action('um_user_registration', 'um_user_registration', 10);
function um_user_registration($args){
    global $ultimatemember;

    unset( $args['user_id'] );
    do_action('um_add_user_frontend', $args);

}

/**
 * Procesamiento del formulario
 */
add_action('um_submit_form_register', 'um_submit_form_register', 10);
function um_submit_form_register($args){
    global $ultimatemember;

    if ( !isset($ultimatemember->form->errors) ) do_action('um_user_registration', $args);

    do_action('um_user_registration_extra_hook', $args );

}

/**
 * Registrar usuario con rol predefinido en opciones
 */
add_action('um_after_register_fields', 'um_add_user_role');
function um_add_user_role( $args ){

    global $ultimatemember;

    if ( isset( $args['custom_fields']['role_select'] ) || isset( $args['custom_fields']['role_radio'] ) ) return;

    $use_global_settings = get_post_meta( $args['form_id'], '_um_register_use_globals', true);

    if (isset($args['role']) && !empty($args['role']) && $use_global_settings == 0 ) {
        $role = $args['role'];
    } else if( $use_global_settings == 1 ) {
        $role = um_get_option('default_role');
    }

    if( empty( $role ) ) return;

    $role = apply_filters('um_register_hidden_role_field', $role );
    if( $role ){
        echo '<input type="hidden" name="role" id="role" value="' . $role . '" />';
    }

}

/**
 * Mostrar el botón de envío
 */
add_action('um_after_register_fields', 'um_add_submit_button_to_register', 1000);
function um_add_submit_button_to_register($args){
    global $ultimatemember;

    // NO añadir cuando se revisan los detalles del usuario
    if ( isset( $ultimatemember->user->preview ) && $ultimatemember->user->preview == true && is_admin() ) return;

    $primary_btn_word = $args['primary_btn_word'];
    $primary_btn_word = apply_filters('um_register_form_button_one', $primary_btn_word, $args );

    $secondary_btn_word = $args['secondary_btn_word'];
    $secondary_btn_word = apply_filters('um_register_form_button_two', $secondary_btn_word, $args );

    $secondary_btn_url = ( isset( $args['secondary_btn_url'] ) && $args['secondary_btn_url'] ) ? $args['secondary_btn_url'] : um_get_core_page('login');
    $secondary_btn_url = apply_filters('um_register_form_button_two_url', $secondary_btn_url, $args );

    ?>

    <div class="um-col-alt">

        <?php if ( isset($args['secondary_btn']) && $args['secondary_btn'] != 0 ) { ?>

        <div class="um-left um-half"><input type="submit"  value="<?php echo __( $primary_btn_word,'ultimate-member'); ?>" class="um-button" id="um-submit-btn" /></div>
        <div class="um-right um-half"><a href="<?php echo $secondary_btn_url; ?>" class="um-button um-alt"><?php echo __( $secondary_btn_word,'ultimate-member'); ?></a></div>

        <?php } else { ?>

        <div class="um-center"><input type="submit" value="<?php echo __( $primary_btn_word,'ultimate-member'); ?>" class="um-button" id="um-submit-btn" /></div>

        <?php } ?>

        <div class="um-clear"></div>

    </div>

    <?php
}

/**
 * Mostrar campos
 */
add_action('um_main_register_fields', 'um_add_register_fields', 100);
function um_add_register_fields($args){
    global $ultimatemember;

    echo $ultimatemember->fields->display( 'register', $args );

}

/**
 * Establecer gravatar del usuario con user_email
 */
add_action('user_register','um_user_register_generate_gravatar');
function um_user_register_generate_gravatar( $user_id ){
    global $ultimatemember;

    $ultimatemember->user->set_gravatar( $user_id );

}