Duplicate groom and collision groom with character

Hi, i follow the tutorial on unreal engine, add groom to character, i do as in image:
After i move Groom component as child of mesh to set parent socket “Head” and to have the groov that move with the movement of head. But when i move with child mesh i have a duplicate of hair but as component there is one groom. Where is my error?
Another question is when i have the groom in head, as i do to enabled collision head with body as shoulder? I seed that the hair cross the shoulder. Sorry for my English.

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