Enchanted book not selling

[rezz506]

For some reason, just the Sharpness V enchanted book won't sell back to the shop. Other books sell back fine but that one specifically won't sell back if not bought directly from the shop.

[Magnum97]

I've seen a similar issue possibly related. Selling multiple items with the same enchant does not work. It will sell one, then show sold out even though another is in the chest. I presume it somehow identifies items in a different way.