Alpha Hair Mesh - Parts of the hair are not showing

I'm new to making Hair CC (Paper hairs) and I've encountered this problem with my mesh.
Basically, every time I try out my mesh in CAS mode and in game, parts of the hair is invisible in certain angles...
But when I rotate it, it shows up. Also it is a bit see-through.

Front CAS view:


Back CAS view:


Side CAS view:



Does anyone know how to fix this? Please help me out, I am so lost.


I used Blender to make the mesh.

My process was:

Create Mesh Plane > Assign Materials & Texture > Transparency to 0 + set into Alpha
> Loop Cut > Edge Crease to 1 > UV Unwrap > Modifier Subdivision Surface + Triangulate >
Join Planes > Modifier Solidify > Transfer Weights from Base Hair > Assign geoms 0000 0001 0002 > S4S Import > Sim Glass

I did not yet apply hat cuts, but I don't think that causes my problems with the transparency.

Thank you to those who will answer.