I am currently experiencing a model replacement issue?

[foooolish]

I replaced the 27-bone model you provided with the 22-bone Smplh model and Mixamo model. After setting up the Actor script, GenericIK script, Motion Controller, and Blueman script, the upper body became immobile, while the lower body bones could move, but the skin did not align with the bones. Then, when I increased the bones back to 27, the whole skeleton moved correctly, but the skin still didn't align with the bones. Could you please explain what might be causing this?

[foooolish]