Not odd. It’s temportalAA or lack thereof.
Also the mip level.
Also the material being completely … well, wrong.
That’s not how a hair shader is supposed to look.
Also, you need to enable the proper normals on it. If you view world normals you can probably see where the dark artifacts come from.
It’s a complex subject and the fact you are starting with a non hair material is the first problem.
(It’s actually surprising it looks that good in the screenshots).
Content examples have haircard materials and a head of hair to check.
Note that the hair may still glow in point lights when done according to how the content examples do it.