Which version of motionEye/motionEyeOS are you using? I recommend dev20201026 for motionEyeOS.
I run 6-7 cameras with my standard motion detection settings are:
Frame Change Threshold 0.1%
Maximum Change Threshold 0 pixels
Auto Threshold Tuning Off
Auto Noise Detection On
Light Switch Detection 0.0%
Despeckle Filter On
Motion Gap 2 seconds
Captured Before 10 frames
Captured After 10 frames
Minimum Motion Detection 2 frames
Mask Off unless there is a part of the scene with motion I don't want to capture / trigger on.
I use Show Frame Changes On until I see that the camera is being detected like I want
BTW, it does not do people / face recognition, just motion detection.