I opened the hive up to inspect, moving the medium foundationless off to the side. They were building nice white comb.
I had much resistance picking up the medium. Now I see THIS on the top bars? Are these queen larvae from queen cells attached to the bottom of the medium that ripped open? These larvae look more like grubs!
Also, my hive was extremely docile today, and that's not usually the case. Seems that they're honey bound too, but I didn't check all frames.