[Plugin: Category Images II] Subcategory's: Image shows photo of a category in stead of subcate

Hello,

I would be glad if someone can help me out on this one:
the thumbnail doesn’t show up at the subcategories. In stead of the image chosen for the subcategory, I get the photo of the mother category.

This is my code:

<?php
$cat = $post_category[1]->slug;
$args=array(
  'cat' => $cat,
  'post_type' => 'post',
  'post_status' => 'publish',
  'posts_per_page' => -1,
  'caller_get_posts'=> 1,
  'depth' => 1
);
    $my_query = null;
    $my_query = new WP_Query($args);
    if( $my_query->have_posts() ) {
      while ($my_query->have_posts()) : $my_query->the_post(); 

	echo ciii_category_images();
?>

I have tried a ceveral ways to chose the category ( ‘cat’ => …) but I always get the image of the mother category.

This is were the category image should be seen:
https://www.koop-huis.be/kanaal/carriere/carriere-sub/

Thanks in advance.

Rick Hazebroek
Fraai Webdesign
https://www.fraai-webdesign.com

https://www.ads-software.com/extend/plugins/category-images-ii/