IDK, I truly don't.
This has been a problem for me for at least a year. I know the site used to have someone remove OLD posts and threads, but not new ones.
New posts, if not appropriate, generally generate an "edit" on the post (which shows up) or a deletion with a PM from admin etc.
However, this was neither of those issues.
I've been asked to send in any post that disappeared, but that would require photocopying (online) each page I leave a post.

I've suspected many of my postings missing before, but could never be absolutely sure I didn't change my mind, or maybe answered the same thread in a different forum. (This speaks to those who double or triple post the same questions in various forums! lol)
But this particular post I am absolutely sure of! Ok guys, where is it?
Maybe the site enters a vortex of parallel universes and it posts into the wrong one at that moment???