I went into a hive this morning (checkerboarded mid-Feb.), just to put a super on top. I saw brood all the way to the top box so I decided I'd better do a quick look for queen cells. I lifted the top box back and there was brood torn apart on several of the frames. Couldn't really see in to see if queen cells and no time to truly inspect. Decided I'd look in the 2nd box and I also tore apart brood there too. I don't remember this happening before. Is it normal to have brood on top of frames like that?