Scripted idle animation, but some parts are stubbornly welded. How to fix?

I animated some animations, in which it involves the mesh part welded to the right hand moving away from the right hand. When I script it, the animation runs but the mesh part just sticks to the right hand no matter what... Any solutions? https://gyazo.com/34b9575278a49c665105e007c47e4103.gif https://streamable.com/64pfr https://gyazo.com/3b74e2fc49de293250045fd17095ddbd.gif https://gyazo.com/ca67bfe30a24410efef01663b34172e4.gif https://gyazo.com/4750d097554cecd255818ca172ed13a1.gif https://gyazo.com/c335fd65b8e8a4b6dd212dcb72328cd0.gif