When is motion detection NOT motion detection?

Out on my garage, I have a Ring stick-up camera, 2nd generation. It works fine during the day, I get motion events from it. After sundown, there's still a little bit of light at the garage, from the street lamps. If I walk under this camera after dark, I see its red and blue LEDs light up - meaning it detected motion, right? But I get no motion events or recorded videos.What am I missing here? It seems the camera is "detecting" the motion in some sense, but then deciding it's not real. Or something like that.