This seems to be an issue with your browser - I wish I could tell you what it might be, but i have no way of knowing. It's not a problem others are seeing.
This isn't just throwaway advice... honest. Try clicking the log out button and then come back and relogin. This will clear your site cookies and "might" fix your issue.
Other than that, all I can say is if you figure out what your problem was after solving it please let us know what you did.