I've never seen this before, and am unable to reproduce it here. I can't see how it could happen if I'm honest, but I would take a guess that it's a problem with your webserver.
What webserver (Apache, IIS, etc) and version are you running? Also, what version of PHP are you running?
Also, if you could take a screenshot when it happens or set me up an account on your forum so I can see it in action it would help a lot.
Thanks,
Alan.
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