I'm sorry, I hit enter far too fast on that one. It is also possible to do it with a Theme, but those apply at a space level (or globally). Can you check if you are looking at the same space as other users? Also, is there a chance of screenshots?
Interesting. That looks like broken css so there's a quick test - clear the browser cache and restart the browser - does that help? The other thing I notice is that the sidebar on/off switch is missing from your screen (to the right of "group centre"), that makes me suspect it is related to that - maybe your sidebar has been turned off, but the system has a problem where it's not hiding it correctly. So, the other test is to ask one of your colleagues to turn their sidebar off and see if they have the problem.
Apart from what Nic already suggested, I recall a similar issue which also only occured on one workstation; It was related to Internet Explorer's compatibility view, which was (unintentionally) enabled at that point.
Please check if you see the "torn sheet of paper" icon at the very right of your addressbar as stated in this picture:
If it's enabled, just disabled it and see if it's better.
Hope that helps!
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