This is something that's known, and while I don't know if there's a good and reliable way to fix it (as there doesn't seem to be a good reason why it should be happening in the first place), the resref of these mis-tagged/unidentified items that are returned is correct, so the items look and act like what they are supposed to...even stacking with items of the same type.
So, it's kind of goofy, but the items will work just fine. I think also that they return to normal (description/identification) if you relog.