We have had some cold weather here lately, down in the 20s at night. The last 3 days we have been in the 70s. I started feeding them 1:1 syrup 3 days ago as their honey stores where getting a little low. I have 3 hives lots of activity in all 3 hives. One hive for the last 3 days have been bearding, whole front of the hive covered with bees. My hives are 8 frame, one deep and one medium. Do I have a over crowded hive?