Starting today, Best in Bags has been suggesting that I replace every single item, but most of the time it’s suggesting that I replace it with exactly the same item, which seems to be a bug.
This usually happens if you do a BiB after importing from the armory. You need the last load of your character to be from the addon.
Try exporting from the addon again and then do BiB.
Ah, yea! That fixed it. Thanks!