I recently put some 5 frame nucs into their deep hive bodies and when I went to open them up today, I noticed that on 2 of them, they were drawing comb from the top of the frames to the bottom of the cover making it to where when you pull off the cover, the middle two frames with all the bees on them come up with the lid. I have been doing this for 5 years now, and this is a first for me. Is there a reason that they do this or is there something I can do? The hives smell great with honey and they have about 4 frames they are drawing out so I know space is not an issue. Any help here is appreciated.