You *have* been seeing new posts pop up and then disappear. I’ve been trying to untangle some of the hijacked threads — by creating new posts for some topics, and then assigning comments to these new posts (using a new tool I just found, hooray me). But, since posts have to be ‘published’ in order to receive comments, I’m ‘publishing’ them early, adding the comments, and then un-publishing them until next week.
If you’ve wondered why some of your comments have disappeared, it may be because they were part of a comment subthread that took a sharp turn. Look for them on an upcoming post. ~ cvh