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Why not showing all post by default in my jquery filter

Hello Expert Developer,
Can you please take a look on it, What i did messed up?

function mysite_filter_function(){

//groups checkboxes
if( $groups = get_terms( array( 'taxonomy' => 'category' ) ) ) :
$groups_terms = array();

foreach( $groups as $group ) {
    if( isset( $_POST['group_' . $group->term_id ] ) && $_POST['group_' . $group->term_id] == 'on' )
         $groups_terms[] = $group->slug;
}
endif;



$tax_query = array( 'relation' => 'AND' );

if ( ! empty( $groups_terms ) ) {
    $tax_query[] = array(
        'taxonomy' => 'category',
        'field'    => 'slug',
        'terms'    => $groups_terms,
    );
}



$args = array(
    'orderby' => 'date',
    'post_type' => 'course',
    'posts_per_page' => -1,
    'tax_query'      => $tax_query,
);

$query = new WP_Query( $args );

if( $query->have_posts() ) :
    while( $query->have_posts() ): $query->the_post();
        // echo '<h2>' . $query->post->post_title . '</h2>';
        // get_template_part( 'customcourse');
        ?>
        <div class="col-md-4">
            <a href="<?php echo esc_url( post_permalink() ); ?>">
                <div class="course_post_card">
                    <div class="course_title">
                        <h2><?php the_title(); ?></h2>
                    </div>
                    <div class="course_footer">
                        <div class="course_footer_location">
                            <a href="<?php echo esc_url( post_permalink() ); ?>"> <i class="fa fa-map-marker"></i> <span><?php echo get_post_meta(get_the_ID(), 'skips_size', TRUE);?></span> </a>
                        </div>
                        <div class="course_footer_date">
                            <a href="<?php echo esc_url( post_permalink() ); ?>"> <i class="fa fa-calendar"></i> <span><?php echo get_post_meta(get_the_ID(), 'skips_width', TRUE);?></span> </a>
                        </div>
                    </div>
                </div>
            </a>
        </div>


        <?php

    endwhile;
    wp_reset_postdata();
else :
    echo 'No posts found';
endif;

die();
}
add_action('wp_ajax_myfilter', 'mysite_filter_function');
add_action('wp_ajax_nopriv_myfilter', 'mysite_filter_function');

and this is my course page

<?php
/**
* Template Name: Courses Pages
*
* @package WordPress
* @subpackage Twenty_Fourteen
* @since Twenty Fourteen 1.0
*/

get_header();
//Add AJAX path to use in load-posts.js
$getPath = array('ajaxURL' => admin_url('admin-ajax.php'));

 ?>
    
<body <?php body_class( 'site-content' ); ?>>

    <div class="container" style="padding: 80px 0px;">
        <div class="row">
            <div class="col-md-12">
                <form action="<?php echo site_url() ?>/wp-admin/admin-ajax.php" method="POST" id="filter">
                    <?php
                    if( $groups = get_terms( array( 'taxonomy' => 'category' ) ) ) :
                      echo '<ul class="groups-list">';
                        echo "<label><input type='checkbox' name='all' id='all'> All</label>";

                      foreach( $groups as $group ) :
                         echo '<input type="checkbox" class="" id="group_' . $group->term_id . '" name="group_' . $group->term_id . '" /><label for="group_' . $group->term_id . '">' . $group->name . '</label>';
                       endforeach;
                       echo '</ul>';
                     endif;
                   ?>
                   <input type="hidden" name="action" value="myfilter">
                </form>
            </div>
            <div class="row all-post">
                <!-- All the post -->
            </div>

            

            <!-- Load More Button -->
            <div class="col-md-12 align-self-center text-center">
                <button class="btn btn-primary" id="loadMore">Load More</button>
            </div>
        </div>
    </div>



</body>
<script>

$('#filter').change(function(){
    var filter = $('#filter');
    $.ajax({
        url:filter.attr('action'),
        data:filter.serialize(),
        type:filter.attr('method'),
        beforeSend:function(xhr){
            //filter.find('button').text('Processing...');
        },
        success:function(data){
            //filter.find('button').text('Filter');
            $('.all-post').html(data);
        }
    });
    return false;
});

</script>
<?php
get_footer();
?>