Are you viewing it on a smartphone when it happens? Chances are, it's the mobile version of the site and if you scroll around, you can find a link to view the original version.
I am using my laptop and it is only in certain parts of the websites. For example when I go to the Fifa 11 forums I can read everything fine until I try to post a comment and then it goes mad.
If you have more than one browser on your laptop, try another browser. That will show if it is a browser- or settings-related issue. Are you running any script or ad blocking extensions?
What browser are you currently using? Try using FireFox and see what happens, If you still have the problem then try updating your Video Driver to the newest one...