Here’s a still from your first video:
This is definitely an insect. What happens is that (1) insects are great reflectors of IR light, and (2) they move fast across the frame during the time the shutter is open. During that time (something less than 1/10th second) there are many wing beats. Those show up as a bumpy blur. In this case, you can count approximately 11 wing beats during this frame. That’s well within the normal potential of 100 wing beats per second that insects do.