I have a browser and slow (mobile data) connection that does something similar from time to time. Instead of properly loading everything, it loads all links, forums, etc down the left hand side (but not compressed as in your case)... in Times New Roman script. If I then select (say) View New Posts it corrects itself.
I know it is trite to say, but have you logged-off your Windows profile, then logged on again... or better, powered down and re-started after ten seconds? I find this fixes many browser problems. I use three browsers for various reasons, and sometimes there is a glitch in starting up. Opera will sometimes start up and tell me there is a file or resource missing and stop dead in it's tracks. Re-starting the computer fixes it.
Also I find much slower loading times for RP compared to other sites and this might affect how it screen appears.