Groom asset with reflection problem

Hello guys
I have a problem for months now with groom asset in unreal. When my groom is in level, any levels (even calibrated one, good lighting value, etc..) my groom reflects the whole environment.
Im working in lumen, lumen reflection and im wondering if it’s not related, but i just cant find the reason.
The only thing that make me think it’s the lighting/lumen is because the groom look fine by itself.
(sorry for the bad english, not my first language)