Material Metallic Tinkle Shiny Problem in Light

Hello I have a metallic problem while developing with Unreal Engine.

the Problem is Metallic Tinkle Shiny in Light

You can see the problem by looking at the back of the character and the gun.

this is metallic and roughness map

this is material editor

i don`t know what is it i just work in on the my landscape
I think it seems to be related to min roughness.
But I can not solve it directly

plz help me thank you!