I strongly believe that Meta is not the most appropriate board for the kind of OP post.
OP is actually asking for a help on how his/her posts disappeared. And here is Beginners and Help board. When I was a newbie, I never knew the essence of Meta and the kind of posts that will go there, until I learn to read the descriptions at every board. Unlike B/H which looks somewhat self explanatory.
Though, most times a topic would be suitable in more than one board.