No access to other chat rooms

Hi there!

I can't access the chat rooms, other than the main one. It happens on a 1 WoX only, it works just fine on the others.
I already tried several hard refreshes, cookies/cache deleting, computer restart and other web pages (Chrome/Safari/Mozilla). I use a MacOS Sierra version 10.12.6
The "Room" button seems to disappear behind the upper box, please find some screenshots taken during the +-3s website loading timelapse.

Thanks a lot by advance for helping.