'Nothing found' problem

Hi,

I am having a trouble with my site and I dont seem to get the source of the problem. The main problem is that unlike other categories like Дом, Градина,Здравје, the fourth category in my webiste called Рецепти, doesnt seem to colaborate like the other categories.Now my main problem is this - Once you open the post from the category Рецепти(Lets say you open this post Post) and you scroll down to see Related posts I get ‘Nothing found’. Same thing shows up if I try categorizing on the homepage and want to show the posts from that particular category.Tried reworking the code in theme editor in WordPress panel but the main problem that concerns me is that the other categories work just fine and i have problem with the fourth and the fifth category and dont wanna mess up the code too much. So I`m asking for help desperately because I am working on this problem for weeks and dont seem to proggres.

This is my website : Dom i Gradina

Thank you for your buckup and hope to get answers that will help me fix this mindblowing problem.