Hair particles hair dynamics not working correctly at all

i have spent 10 hours creating hair, and after turning hair dynamics on, with untouched settings under hair dynamics, the hair doesnt move with my models head. i tried stuff like deleting the bake, making sure the only thing under modifiers was the armature modifier and the hair particle system one (hair particle is under armature)

if i first turn on hair, the hair moves fine, but if i comb/add more/etc., it just freezes in place and doesnt follow the head movement. anyone have any ideas on why this is happening?

edit -
i have tried this with multiple models, and all of them have the hair freezing in place problem, so it doesnt look like the model itself is the problem