also have this problem. my roomate and I share a computer. sometimes when i log into my account HER email shows up. or if I do get my email, when i go to favorites, i see her favorites and not mine. it's like we each get part of our own and part of each others information. Makes it very hard to keep it all straight, not to mention maintain our own privacy
consider logging off properly --> LOG OUT from your mail
and --> 
Logout from the forums
each and everytime you decide you're done with POF.
When you log back in, ensure the right username is populated in the login prompt.
Just closing your browser will not solve your problem.
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