Its frustrating when innocent posts are deleted. I'm not sure what happened, but I know sometimes good posts disappear because they quoted bad posts. Cleaning up the forum sometimes involves removing not only the bad posts, but those which quoted them. But I don't know if that was the problem. Only the moderator can say for sure.
The moderator of the Popular Media forum is Angela Tate. Here is a link to her profile, you can send a PM from there.