XF 1.5 Users logging in as other users!


Hello Xenforo community,
Lately I have been experiencing a weird MAJOR bug at my forums (http://www.happy-hg.com/forum/) in where RANDOMLY there is a very low chance of an user when logging in to it's account, to be logged with someone else's account instead of theirs. I have no idea what are the steps to reproduce this bug as it's completely random and it can happen with any account logged in from any user. I thought it could be a cache problem so I rebuilt all forums caches and it still kept happening. I had this problem in the past once but it seems to have solved but now is back :( Any ideas what could be causing this?
Please Help!
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