It seems frictioblesss between two rigid body

[xujiangping]

https://github.com/user-attachments/assets/d4d406b1-b63f-4dab-a170-be9842842c59
GravSceneZhj.json
ZHJ_stp.zip

Above are the video, also the json file and the model file. My question is that: why the friction is so small between the rigid bodies. Also I found the lowest body continuing sliding on the floor, and shaking. Could you give me some advices? Thank you very much!