I run 10 to 15 comb honey supers (med. and shallow supers) for cut comb and chunk honey sales at our local farmers market. The last couple of years i have drone cells on the bottom half of some of the comb honey frames? These frames are above the queen excluder and it's always drone brood no worker cells, an old time beekeeper (older than me) told me that in strong hives with several supers on, that you can have some laying worker activity in the upper supers? Makes sense to me, but was wondering if there could be something else going on here and how to prevent it?
PS. i have at times had this problem in honey supers above the excluder also?