Vanishing post.

I made a post a while back, that's only viewable on a certain filter. Now I can't see it. The same thing happened right after I posted it, as well. It wasn't there, and I wonder what had happened. After logging in and out, it appeared again, but... now it's gone once more.

Has anything like this ever happened to anyone else?

Edit: It's also possible that I just never finished writing it. Then I locked the new (still unfinished) version to "private" instead of posting it on the filter, and deleted the older (unfinished) version.