Custom rig scaling wrong?

I’ve been working on a Custom Rig for some-time however whenever I enable Automatic scaling in the Humanoid the below happens.

Right is Auto scaling disabled and left is enabled.
Ideally I want to have the scaling enabled so I have freedom with my rig.

I’ve attached the .rbxm file for the rig - I’m yet to discover a solution and have spent some time on this now. Does anyone have any suggestions?

Rig.rbxm (18.9 KB)