Leg issues

Hey folks, I seem to be having an issue with my characters legs, in Unity it looks just fine but when in VRChat it’s looking super funky. Is there anyone who can help identify why this is happening/what error I’ve made?

Unity:

VRChat:
unknown

I feel like it’s something super simple but I’ve spent the past couple hours looking for an answer with no luck. Hoping someone can save my brain! I’m new to avatar creation so please be gentle! :sweat_smile: