Vellum Hair problem1634 6 2
I simplified your scene a lot, so I could make sense of what was happening. Sorry, I'm not familiar with all the new vellum nodes, but I found a pretty serious issue early in your chain. You are scattering points for your hair on the surface of the fbx, which changes every frame. Because of this, your hair guides get completely out of wack. I changed the hairgen mode to per point, instead of on surface, and things appear to have been fixed.
The main problem you are seeing here is your collision geometry and the length of your guides. If your hair guides interpenetrate the collision geometry at the first frame, then they will get stuck inside. One fix would involve scaling your collision geometry (the fbx) up over time, so that there are no interpenetrations at the start. Then as the collision geo grows to full size, the guides will collide against the geometry properly. I've attached a new hip that demonstrates how there are no obvious issues with the collision geometry disabled.
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