I've only seen one of your topics being closed. Its most likely because you asked a question, and it was answered, and since it wasnt a question which could generate lots of discussion, there really is no need to keep it open.
Back in the days when I used to be a global moderator, I was forever closing topics which either was full of spam and off topic, or arguments, or because it was not a suitable discussion. If the reason why it was closed was in some way bad for the community, I would post a message in the thread, then close it, and if serious, I would PM the member(s) concerned.
So I dont think you're in any trouble. Dont be alarmed or anything like that I bet this gets closed in a while