Weird hair reflection under Nvdia Iray (looks like black and white hair)
I was rendering FE Diverse Hair Vol 1 for Genesis 8 and 8.1 Females | Daz 3D.
Under texture shaded it looks like

But under Nvdia Iray it looks like

The hair color is pure black but the white parts on the hair look more like white hairs than natural reflections. How does this happen and how do I make the reflection more natural? Is there a way to weaken or turn off such reflections?

Comments
I don't have that hair.
Is that with default settings?
I would turn down glossy weight, and also check if dual lobe is enabled with a high weight. And also increase roughness, for whenever there is glossiness.
Yes, that is basically the default. Thanks for the help!