Your posts probably got moved to somewhere more appropriate. Perhaps the Got Questions thread.
If you want to know if they were moved:
1. Click on profile
2. Click on view my profile
3. Click on statistics
4. On the statistics page, there should be an option to see all your posts. It should also say on which thread the post is in.
Unless your thread actually got deleted. But I'm pretty sure that's not the case, since I remember seeing your thread being moved somewhere.