I have a 24 frame top bar hive with window on the side. Last week we had pretty good weather so I opened the window to look inside and it had a watermelon size ball of cluster. To prevent them from swarming in the spring I decided to put 8mm spacers for them to have enough room. Now it seems like there is a lot of space and today when I looked I saw 2 balls of cluster. It seems like they seperated. Is that okay, or is that normal? What does it mean?