[WT 2.3] Can't change page to see additional videos in library

I am trying to check missing subtitles but when I go to my TV Show library on WT 2.3, I can only see the first 15 TV Show folders and I cannot see others. Probably it is a visual glitch, but I don't know how to change page and see the others.

I am running Google Chrome v. 55 and WT is running behind a reverse proxy (which works fine). There is what I think being a page selector at the bottom center of the page but it is empty and I cannot select anything.

Any clue?