So, after refunding someone 30 grass I figured I'd make a thread about this. If you accidentally drop an item near it's shop at /warp market it'll gather with the display item on top of the anvil, and you are unable to retrieve it. Since there's really no way to get around the items collecting together, maybe a new way to display the item would work better.
I was thinking of making a thread about that anyways, it happened to me a few times. Annoying and support