What is the Short chubby bee swarming at night?

I myself am a beekeeper and know of no bees that will swarm actively at night. With this said, any bee colony that does swarm may not find a new location to move to in a 24-hour period after swarming from the old colony. So these bees will just stay at the current location (Usually a branch)until the scout bees find a new location to move into the following day. As far as being a “Short chubby bee”, I would think that this would be a bubble bee or one of it’s cousins.