What's wrong with Rating thread system?

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http://forums.opensuse.org – I was trying to rate a thread a while ago, that thread was already rated by some one before. When i click on the rating button, it is telling me that i already rated the thread, even i did not use that button before for that thread.. After this i tried to check other threads which are already rated and the same thing...even some threads i did not read at all, so how can i rate them.. So is this just me or this is the system issue? Thanks. (Distributions)