Certain page links in pagination missing

Hey.

This is my site: https://zmagazin.cz (BresponZive template).
The problem I’m having is that certain page links in pagination down below the article overview are missing. When you first load up the page, you’re on page 1, and the button to go to page 4 is missing. On page 2, all buttons are shown the way it’s supposed to be, but when you get to page 5, the second number is suddenly missing.

I’ve looked through the code for a couple of hours now and am not able to find the problem.

Help?

Thanks, Nojp