I never warehoused my backgrounds in my CW shop, except one, the Subeta celebration BG. All else were unavailable, except the original. I never messed with them, all were able to buy, unlimited. I had to do all of it again, manually put them back in my shop. Why is that?! How come they were auto-warehoused?!
This may be related to a problem from back in March, and there is a post in the CW announcements thread about it here: https://subeta.net/forums.php/gotopost/67984024