Hello,

I have checked the site with plugins off and plugins on. I do not see any problems. I have created a testing page and created two elements of Product Grid. The first one shows 2 items from Čokoláda the second from Profesionálne Espresso, as you can see the products are displayed correctly.

Make sure you are inserting the correct spelling and language of categories, for example, you are inserting Čokoláda and not chocolate

Best Regards