Well, on the bright side, it's a good bug to get on a Krong curse... as opposed to it happening when he's pleased by you.
Krong shows you the total enchantments on your item, not what it has added to the item. So if the item had been previously enchanted, and this Krong removed that enchantment exactly (and didn't make anything else worse), then this is what you would see. Otherwise, sounds like a bug to me.