There is a bug with glue balls. The tooltip hover stays on the location in the shop that I took a peg away from with the glue ball. So it still says "pizza" where a pizza peg originally was.
Screenshot: https://imgur.com/a/AV9wkUh
The tooltip does go away after dropping the glue ball but it's pretty annoying in the meantime since it overlaps the tooltip of other items in the shop.