I understand now as many of us used to do is when they want to filter their posts clicking a category in the category widget
sometimes you can still see posts of other categories! and here comes my php complicated search finding the reason why and how to prevent it..
=_= Ehheh heh heh heh
The posts that are displayed are usually related to the selected category’s “Sub-Category” so simply remove the parents “do that in the Category section under “posts” menu in your CMS..