Problem with hair shading

Hello,

I has been creating characters for Unreal store for quite some
time, but I have not been able to fix one problem. The screenshot
shows that the hair has a strange faded tint. This can be seen in any
version of the engine. However, everything is ok in a special well-lit
scene (see screenshots). I checked the post-processes and found
nothing that affects this glow. What could be the problem?

Thank you in advance for your response!