I posted an update with another guess as to what Blizzard changed with some of these older items – you will need to re-import from the addon for the change to take effect.
If anyone encounters any other items showing as the wrong item level (either as too high or too low), please post a snapshot AND let me know which specific item it is, and what item level it is showing in-game as compared to on the website. That last part is key… if I don’t know what item level the item is supposed to be, it is very hard to reverse engineer.