Welding character model to a moving part

[gmeww (Tuyn)]

I’m working on a custom player control system for my 2D game. The idea is to have a ControlPart that handles movement, and I want to weld the character model to this part so I can play animations.

To do this, I used a WeldConstraint

When play tesing, the character model keeps tilting

Does anyone know what might be causing this or how to keep the model upright?

[CynthiaValor (LordessCynthia)]

Part0 should be the HumanoidRootPart.

[gmeww (Tuyn)]

I found an alternative approach. Instead of controlling the ControlPart and welding the character model to it, I can directly control the HumanoidRootPart.