I lived in low country in SC at one time and they had so many bugs that at night the infrared eyes would see them just like that. Where you live do you have also lots of bugs?
@Ian97 I love the Strangers Things reference, lol!! I have seen something similar, but mine is usually dust/dirt being kicked up by a moving vehicle or animal. We get small insects as well, but not swarms of them. When I first got the Eufy cameras they use to detect them all the time, now they don’t, which is great!