I have 2 hives and other than taking the top off and peeking inside I haven't gone into the hive for an inspection in 2 or 3 months. Went to check on them early this afternoon and they were coming and going like normal. Came out an hour or two later and one hive seemed to have a lot more traffic. I went down to look and found a lot of bees fighting and a bunch of dead bees in front of the hive. Didn't have an entrance reducer on it so I thought maybe they were getting robbed. I placed an entrance reducer on it. On my hive stand I had an old frame with comb that had been left there quite a while back when I switched over to all mediums. Noticed there was some bees on it in a small area. I went and looked closer and there was a queen! Not a huge number of bees with her, maybe 20-30. Well I set up a medium box, took a couple drawn frames out of my second hive that didn't seem to be having any problems (still lots of bees in there) and shook the bees off the frames and put the frames in the new box with her. About half an hour later she was back out on that old deep frame. So I took a nuc box and put the old frame in with her on it and the drawn mediums. She has some bees following her but not many. Not anywhere near like what I would expect to see with a swarm. Both of my original hives seem to still have strong numbers. I didn't want to go in and look for the queens given how they were fighting.
Any ideas on what happened here?