Issue with morph proportions

Hey everyone, I recently made a morph, got a script for it, etc.

However, I am having an issue
This is how it looks like when it’s not moving. Looks fine right?

But the issue occurs when you start moving.
As you can see in the image, the hands separate from the arms whilst moving. I’ve tried moving the middle part but it still seems off. Is there something I’m missing here? Are the proportions just not compatible with a normal roblox rig? Or is there a certain way to do this stuff that I haven’t learnt yet?

Any help would be appreciated!

(Also sorry if I’m using any of the wrong terminology, I don’t really branch out of modelling)

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