Showing subcategories from parent modx revo?

Question

MODX

Good afternoon, something is not clear, I'm trying to display subcategories only from parents.

In the template itself:

It turns out:
I go to the category -> I see subcategories -> I go to the subcategory, and there the products are in the place of hidden subcategories with the design of the chunk for displaying the category and there are product names .... This should not be. If subcategories do not have their own subcategories, then nothing should be output right?
the category chunk itself:

<div class="item">
  <img src="" alt="" title="Good afternoon, something is not clear, I'm trying to display subcategories only from parents. In the template itself:[[!getPage? &elementClass=`modSnippet` &element=`getRe">
  <div class="background"></div>
  <a href=""></a>
</div>ф

Here is the site:
link
For the test: Select advertising racks, then Metal racks and there for the place of blocks of these products ..