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On a vB3.8.x Site i am administrating something weird is going on currently. The rating system for threads is kinda f**** up.

People telling me that in some Forums they can't rate a thread but getting the message that they already have rated the thread, which they haven't.

How can that be and what could have been broken ? Because I remember, it worked before. Same for me as Admin, some threads I know for sure I didn't voted for already, tell me that I did already vote and can't vote again.

Someone heard of that issue maybe ?