Another update and possibly a solution for some case where posts were not properly deleted. There is a limitation in Powerdelete. Here is a link to a new version and alternatives:
https://www.reddit.com/r/ModCoord/comments/145fico/comment/jnl4xmr/
The restores could also be rollbacks from the server issues or post haven't been properly deleted due to subs being private during blackouts.
Many have experienced the same issue, there is a discussion here on kbin:
https://kbin.social/m/RedditMigration/t/34112/Heads-up-Reddit-is-quietly-restoring-deleted-AND-overwritten-posts-and
#redditblackout #redditmigration #kbin #lemmy
Commenting to say I have had the same experience. I think people who deleted their accounts have had them come back as zombies