I started beekeeping last year with one colony. Even with minimal knowledge my hive made it through winter and seems fairly strong. This spring I reversed the two hive bodies as I had read in a book to help reduce swarming. About one month ago I added a new shallow super hoping to add a place for honey storage. I've been checking hive periodically but the bees won't build any comb in it and only a few bees are in the super. Hive in lower two bodies seem healthy with a lot of bees and brood and top deep is heavy so I know there is some honey. Can someone please shed some light on why bees won't use this top shallow super? I was really hoping for a good honey crop this year. All help greatly appreciated!! THANKS.