The shape keys on my model in blender work perfectly but when I throw that model into SFM the shape keys work along with unintended vertices that move randomly, these random vertices don't move in blender. https://imgur.com/4exV01l

https://imgur.com/gfGxxq8 Some parts of a model appear on the inside of the mesh leaving the outside blank, why?

Bones exist and transform the model correctly but instead of the bones being in the correct places they're all cramped together / smaller than the model itself, why?

The problem was there was no material in blender that matched the vmt, you are a saint.

I'm making a model for source, I have a problem in the QC but I can't figure out what it is. The texture doesn't work and I've spent a few hours juggling between the VMT and QC files but I swear the paths have to be correct