It was nothing special, thats why it is strange. I have checked the database and I could not find anything wrong, the B_Sticky was 0 on every post in the thread and B_Topic was 0 except the initial post which was 1. I tried making it sticky or global announcement and then unstick it, it made 4th copy. I made a test forum and moved one of the 4 threads to it, all 4 copied instead. I finally deleted the thread completely, well I lost a topic, but everything seems to work fine after that.