Glowing Hair in sunlight

I a character animator on a game I work on, i’m trying to solve a bug where the hair cards on our NPCs glow in the engines daylight. Happens at all LODS, and I’m not sure why could be causing i, anyone had this issue before? Were using unreal engine 4

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did you find an answer for this? I have a similar problem but mine glows with point, rec, and spot lights.

Change the opacity in materials to -1.0
Change material’s opacity to -1.0

It’s not just directional lights. Try spot or point lights…

The culprit is a clear discrimination by Epic against gingers…