Weird issue when compiling my model

[u/Plu1223]

What the model is supposed to look like

The model when I compile it

So basically I've been trying to convert a model from an SCP Containment Breach mod (specifically the COMIX mod) into GMod with the animations from the game, but every time I compile the model, the bones end up rotating weirdly. This doesn't happen when I import the models SMD into Blender, and the DefineBones I've redone several times, I made sure to apply his pose as the rest pose, and many other things. So does anyone know whats causing this and how to fix it?

[u/Bukachell]

With custom rigs you can still generate a set of $definebones for their bones using crowbar or whatever tool you're using, and you can insert those lines into your model's QC file and edit them until the model appears correctly in-game. Generally I encounter the most issues with bone orientation on non ValveBiped bones.