The issue is the feet are overlapping off the green floor. You need complete isolation so green all the way around the person. Not only the people’s feet…. but the “stand here feet”. You need a little green between those and the edge.
This is how this feature now works. I had to set it up this way to prevent it from removing sports equipment like the old Auto Clear used to have a big issue with. It is all explained in this video. Watch the ENTIRE VIDEO and then it will all make sense. Then make adjustments to you green screen setup so it will work with the clear feature.