While splitting a hive this spring, I noticed something I hadn't seen before. The hive overwintered in 2 deeps. I split the boxes and didn't check the bottom deep to well. Came back to the bottom deep a few days later, and did a full inspection. Wasn't much to see. The bees had mostly drifted to the queen right hive, and there wasn't much brood in the bottom box. I added a frame of eggs / brood / stores from the queen right hive, and added some sugar. They seem OK for the moment. I noticed in the bottom box, that 2 or 3 frames had had their comb chewed down in the middle. Maybe about a softball sized area. There is quite a pile of wax on the floor of the hive, and the comb was down to being just a few mm tall. I looked around for signs of wax moth or something but didn't find anything. Does anyone know what this is a sign of?