Nostalrius Begins - Quality wow vanilla realm (1.12)

So I was grinding yeti's, for no reason at all I was ported to GM island and then disconnected. Then I am told I'm banned when I try to log in. Can someone please explain why I was banned for playing the game? I was at my computer and received no whispers or anything at all, nor was I breaking any rules.

I did notice that while playing, the mobs I was targetting would sometimes die instantly right before I got my spell off. The first time it happened after a few mobs I said in chat "wtf?" followed by "Is that a GM? Can you pm me please?". There was no message or any sign of a GM so I went along with my business. The second time I paid no attention and this was when I was ported to GM island.

Account name: macgarthur3
Character: Saberris

Something is going on here.... Few other people (including myself) had similar problem :S Hope it will be resolved.
But on the bright side, now i'm active on forums

No idea what's happening. From what I can see I think a GM might have been testing to see if I was hacking or a bot by maybe killing my mobs before I could attack them (not sure what that would show?), but I asked if it was a GM the first time. The second time I didn't really pay any attention and just picked different mobs, then I was banned. Not exactly sure what I did wrong, I didn't even receive a whisper or anything. Would really like an explanation for this and my account unlocked since I did nothing wrong.