Multiple themes not working on WordPress site using a custom theme and BuddyX

I have been working on a site that is meant to have a car listing site but also social aspects for some time now , i created the car listing aspect of the site using a custom theme, that works as intended, but after setting up multiple themes plugin with this config

but when going into the site, for example https://huntx.local/activity/ all i see is my custom theme index, my custom theme doesnt have any buddypress templates so it should interfere as far as i know.

Tried to “graft” the buddyx template into my own, but its too advanced for me to understand and find the files that i need for this to work, all i managed is to get a blank screen instead of the index.

Im going to add the functions.php file from my custom theme in case is needed

<?php

function enqueue_tailwind_styles() {
    // Enqueue the style.css file from the theme root
    wp_enqueue_style('tailwind', get_template_directory_uri() . '/style.css', array(), '1.0.0', 'all');
}
add_action('wp_enqueue_scripts', 'enqueue_tailwind_styles');

remove_action( 'shutdown', 'wp_ob_end_flush_all', 1 );

function custom_login_page_redirect( $login_url ) {
    return home_url( '/login/' );
}
add_filter( 'login_url', 'custom_login_page_redirect' );

function custom_buddypress_activation_redirect( $user ) {
    if ( bp_is_activation_page() ) {
        wp_redirect( home_url( '/activate/' ) );
        exit();
    }
    return $user;
}
add_action( 'bp_core_signup_send_activation_key', 'custom_buddypress_activation_redirect' );

add_filter('bp_email_get_tokens', 'custom_bp_email_tokens', 10, 2);

function custom_bp_email_tokens($tokens, $args) {
    if (isset($args['tokens']['key'])) {
        $tokens['key'] = $args['tokens']['key'];
    }
    return $tokens;
}

function custom_car_listing_post_type() {
    $labels = array(
        'name'               => _x( 'Car Listings', 'post type general name' ),
        'singular_name'      => _x( 'Car Listing', 'post type singular name' ),
        'menu_name'          => _x( 'Car Listings', 'admin menu' ),
        'name_admin_bar'     => _x( 'Car Listing', 'add new on admin bar' ),
        'add_new'            => _x( 'Add New', 'car listing' ),
        'add_new_item'       => __( 'Add New Car Listing' ),
        'new_item'           => __( 'New Car Listing' ),
        'edit_item'          => __( 'Edit Car Listing' ),
        'view_item'          => __( 'View Car Listing' ),
        'all_items'          => __( 'All Car Listings' ),
        'search_items'       => __( 'Search Car Listings' ),
        'parent_item_colon'  => __( 'Parent Car Listings:' ),
        'not_found'          => __( 'No car listings found.' ),
        'not_found_in_trash' => __( 'No car listings found in Trash.' )
    );

    $args = array(
        'labels'             => $labels,
        'description'        => __( 'A custom post type for car listings.' ),
        'public'             => true,
        'publicly_queryable' => true,
        'show_ui'            => true,
        'show_in_menu'       => true,
        'query_var'          => true,
        'rewrite'            => array( 'slug' => 'car-listing' ),
        'capability_type'    => 'post',
        'has_archive'        => true,
        'hierarchical'       => false,
        'menu_position'      => null,
        'supports'           => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'comments' ),
        'taxonomies'         => array( 'category', 'post_tag' )
    );

    register_post_type( 'car-listing', $args );
}
add_action( 'init', 'custom_car_listing_post_type' );


add_action('after_setup_theme', 'remove_admin_bar');
function remove_admin_bar() {
  if (!current_user_can('administrator') && !is_admin()) {
    show_admin_bar(false);
  }
}



//subscriber can upload media

function add_subscriber_upload_capability() {
    $role = get_role('subscriber');
    $role->add_cap('upload_files');
}
add_action('init', 'add_subscriber_upload_capability');

function restrict_media_library_to_users_own_uploads($query) {
    $user_id = get_current_user_id();
    if (current_user_can('subscriber') && !current_user_can('edit_others_posts')) {
        $query['author'] = $user_id;
    }
    return $query;
}
add_filter('ajax_query_attachments_args', 'restrict_media_library_to_users_own_uploads');