This is what I see in my vault today:

Both of these items are things I bulk moved into the shop I autoprice daily; I did this yesterday afternoon. They've left behind a nonexistent item, which cannot be removed. If you try, you get this error:

I actually don't care about them being there, or else I would have filed a ticket. This is more of an informational post so that staff knows that this is happening, as I didn't see a post about it anywhere else. I could have missed it, though.