the bees are sticking together as they go in and out of the hive.
This started happening around two weeks ago about the same time the star thistle started to bloom, does not seem to be happening in our other two hives in a different location on our property. Should we be concerned or is this "normal". Thanks.
I do not understand what means "sticking together"?
If hive is too cramped bees do not fit any more to the hive. You must put more space for them. If you have much ventilating bees, you must widden your entrance.
Look inside, what is happening there? Do they have space for honey and brood?