You are probably spot on that your thread was closed because there already is à thread on the subject ( or À really similair one). Naturally, this should have been pointed out - along with à link to the thread- so that there would be no missunderstanding. It could also be à human misstake, the wrong thread getting closed. Either way, I Will ask Raikan ( the mod in the players section) to have à look at it.
As to why threads get locked, its mostly down to being either duplicate threads or threads being offensive. The reason why threads get moved to the correct location is naturally more obvious, them being posted in the wrong area Of the forum. The most common reasons for people to post in the wrong area is either ignorance, tjat dont care about the postingrules.... Or...that they dont bother to read them...or- and this is the most common- that the rules are often hard to find at the first glance.
Cheers