WordPress CPT Ajax filtering

ajaxcptfilter.txt

//////////////////////////////////////////////////////
HTML
//////////////////////////////////////////////////////
<section role="main" class="<?php echo $listClass; ?>">
	<div class="filter-contain">
		<span>Filter By Category</span>
		<?php
		  $taxonomy = 'project_type';
		  $tax_terms = get_terms($taxonomy);
		?>
		<ul>
			<li id="all-projects">
				<a href="#" class="all-cats current ajax" data-cpt-name="project" id="all-projects-link">All</a>
			</li>
		  <?php
		  foreach ($tax_terms as $tax_term) {?>
		    <li id="cat-<?php echo $tax_term->term_id; ?>">
		    	<a href="#<?php //echo esc_attr(get_term_link($tax_term, $taxonomy)); ?>" class="<?php echo $tax_term->slug; ?> ajax" data-term-number="<?php echo $tax_term->term_id; ?>" title="<?php echo $tax_term->name;?>"><?php echo $tax_term->name; ?></a>
		    </li>
		  <? } ?>
		</ul>
	</div>
	
	<div id="category-post-content" class="project-container">
		<?php $loop = new WP_Query( array( 'post_type' => 'project', 'posts_per_page' => 6, 'orderby'   => 'title', 'order' => 'ASC', ) );
			if ( $loop->have_posts() ) :
		    while ( $loop->have_posts() ) : $loop->the_post(); ?>
		        <div class="project-tile <?php echo the_field('tiled_layout_size'); ?>" style="background-image: url(<?php echo the_field('featured_post_image'); ?>)">
			        <h1 class="posttitle">
				        <a href="<?php the_permalink(); ?>"><?php echo get_the_title(); ?></a>
			        </h1>
			   	</div> 
		<?php endwhile; endif; wp_reset_postdata(); ?>
	</div>
</section>

//////////////////////////////////////////////////////
JS
//////////////////////////////////////////////////////

function cat_ajax_get(catID) {
    var ajaxurl = '/wp-admin/admin-ajax.php';
    jQuery.ajax({
        type: 'POST',
        url: ajaxurl,
        data: {"action": "load-filter", cat: catID },
        success: function(response) {
            jQuery("#category-post-content").html(response);
            return false;
        }
    });
}
function all_cats_ajax_get(cptID) {
    var ajaxurl = '/wp-admin/admin-ajax.php';
    jQuery.ajax({
        type: 'POST',
        url: ajaxurl,
        data: {"action": "load-all-filter", cat: cptID },
        success: function(response) {
            jQuery("#category-post-content").html(response);
            return false;
        }
    });
}
$( ".portfolio a.ajax" ).click(function() {
	$("a.ajax").removeClass("current");
	$(this).addClass("current"); //adds class current to the category menu item being displayed so you can style it with css
	var catnumber = $(this).attr('data-term-number');
	cat_ajax_get(catnumber);
});
$( ".portfolio a.all-cats" ).click(function() {
	$("a.ajax").removeClass("current");
	$(this).addClass("current"); //adds class current to the category menu item being displayed so you can style it with css
	var cptname = $(this).attr('data-cpt-name');
	all_cats_ajax_get(cptname);
});

//////////////////////////////////////////////////////
Functions.php
//////////////////////////////////////////////////////

//PORTFOLIO ajax project filtering
add_action( 'wp_ajax_nopriv_load-filter', 'prefix_load_cat_posts' );
add_action( 'wp_ajax_load-filter', 'prefix_load_cat_posts' );
function prefix_load_cat_posts () {
    $cat_id = $_POST[ 'cat' ];
    $args = array (
		    'tax_query' => array(
		         array(
		            'taxonomy' => 'project_type',
		            'field' => 'term_id',
		            'terms' => array( $cat_id )
		         )
		    ),
		    'post_type' => 'project', // <== this was missing
		    'posts_per_page' => 6,
		    'order' => 'DESC',
	    );
	global $post;
    $posts = get_posts( $args );
    ob_start ();
    foreach ( $posts as $post ) { 
	    setup_postdata($post);
    ?>
	    <div class="project-tile <?php echo the_field('tiled_layout_size'); ?>" style="background-image: url(<?php echo the_field('featured_post_image'); ?>)">
	        <h1 class="posttitle">
		        <a href="<?php echo get_permalink();?>"><?php echo the_title(); ?></a>
	        </h1>
	   </div> 
   <?php } wp_reset_postdata();
   $response = ob_get_contents();
   ob_end_clean();
   echo $response;
   die(1);
}
//PORTFOLIO ajax ALL projects filtering
add_action( 'wp_ajax_load-all-filter', 'prefix_load_all_cat_posts' );
function prefix_load_all_cat_posts () {
    $cat_id = $_POST[ 'cat' ];
    $args = array (
		    'post_type' => 'project', // <== this was missing
		    'posts_per_page' => 6,
		    'order' => 'ASC',
		    'orderby'   => 'title',
	    );
    global $post;
    $posts = get_posts( $args );
    ob_start ();
    foreach ( $posts as $post ) { 
	    setup_postdata($post);
    ?>
	    <div class="project-tile <?php echo the_field('tiled_layout_size'); ?>" style="background-image: url(<?php echo the_field('featured_post_image'); ?>)">
	        <h1 class="posttitle">
		        <a href="<?php echo get_permalink();?>"><?php echo the_title(); ?></a>
	        </h1>
	   </div> 
   <?php } wp_reset_postdata();
   $response = ob_get_contents();
   ob_end_clean();
   echo $response;
   die(1);
}