It's rearranging my old posts. It's possible that this is an artifact of the Blogger crew manually restoring last Thursday's posts, or it means that something is still weird deep down in side of the Blogger source code.
What's interesting is that the missing posts show up with "draft" status, but the specific posts change over time. It will be interesting to see when (if?) this settles down.
I'm not ready to start worrying yet, but if this happens again I will. Sure would be a pain to have to stand up this blog on Wordpress. Got almost 4000 posts and over 10,000 comments I'd have to move.