I agree to double check for problems. If "all is good" ,to my knowledge,the girls leave the drones to "do their thing" and they are booted out only in Fall. Sounds unusual. The only time I had drones kicked out this of time year was in a crowded hive with a dearth going on and my girls needed the food for themselves and brood.Do they have enough food? How do the wings on the drones look? Chewed or shriveled up?