I can only see half my chat window on Server 2. On my laptop, using Chrome. Server 1 is fine. BOTH are fine using Firefox.
Quick fix, it seems to me your zoomed in on this picture , (hold CTRL button and hit - or hold CTRL and scroll down with mouse wheel) for time being, or can go into firefox setting's and reduce zoom
I would suggest clearing your cache if you haven't already; it's a bit of an overused suggestion, but it does clear up 99% of display issues in the games. Failing that I would suggest submitting a Support ticket as well, they can look at your account a bit more in-depth than we can here.