Xgen interactive grooming "Collision" Modifier is abnormal with a custom mesh. Why ?

[Anonymous]

1.Duplicate hairs mesh(named "hairs") from my character(named "mary"). And clear their history.
2.Create interacter grooming splines from "hairs". Set the length to 0.1cm. No any sculpt(view picture bug001)
3.Create a "collision" modifier, and set "mary" as a collison object. Xgen hair is abnormal now (view picture bug002)
4.Even though scale "hairs" mesh large to exceed the distance of collison(default 0.01cm), can't solve this problem.（view picture bug003）

I don't understand why. Who can tell me?

bug001bug002

bug003

[Anonymous]

I test maya built-in sculpt model, and let collision object to offset 1.1cm(collision distance is 0.01cm), can't solve the problem.  who can tell me why ?