Misclick, that's definitely rare but possible if the finger quickly pressed ALT+S instead of ALT+P.
I think I've also misclicked in the past but I immediately edited the post before it even reached 1-2 minutes. But if the date has changed, then I believe it is a reserve weekly posts.
If they reserved posts to get post quota that means post counting time is mostly ending. I am sure they will return a few minutes or hours later to edit their posts. Very likely that they make reserved posts for their farm and after they done with reserved posts, they will return to each account for editing.
I don't think they will spend days to come back and edit.