Hi, everyone! I am at a school in Lugoff, SC and we installed our bees about 3 weeks ago. They seem to be doing ok. They're active, coming and going, working tirelessly. For the past week, though, they've been clustered up at the top of the hive, ALL OVER the top 2 frames. They are covering the front and the back of the frames, on top of one another, but moving around a lot. Have any of you seen anything like this in your hives? Maybe it's normal. But I'm learning, so I'm really not sure. Any advice is much appreciated.