Thanks for sharing, I would be happy to take a look!
In your sensitivity 7 clip, is it possible that the person in the clip started in an unmasked area?
Your sensitivity 9 clip is hard to tell because the video is grainy, but my guess would be there is a slight reflection in your top-right unmasked zone.
Your last video is honestly really hard to tell because of quality issues. What is your video quality on and how are your signal strengths?