Category Father and daughters (subcategories)

Hey guys,

I have a question about the category items.

for example:

I have a Parent category with registered items, and I have child categories with registered items.

Today, when I click on a Parent category, it ends up bringing items from the child categories mixed with items from the Parent category, and in fact the ideal would be to bring only items from the Parent category.

I would like to know if it is normal when clicking on the parent category to display items from the child categories or is it a bug?