So it's a Lydia only thing--again.
I'm on Xbox so there's probably no workarounds or fixes. But if anyone has any ideas, I'd like to hear them. Thanks.
I still haven't bought Breezehome so I'll go ahead and do it. I have about 40 or so Damage Magicka Regens in a cupboard at Vindrel Hall so I'll sell them off and buy Breezehome---and then make Lydia move to Markarth.