Something like this happened to me on another forum. Everytime I posted, it duplicated and no one could view my user profile or access my threads. My case was a little more serious. But I had to make a new account. Strange enough a few weeks later I was going through some old threads and was able to access a thread created by my old account. The staff on the site checked it out and my account had suddenly fixed itself :/
Kinda strange but these things happen on forums, it's very strange I think.