Mesh Triangulated after Sims 4 Studio Import

hi guys. someone know whats happening here?

when on blender the hair looks perfect, but on sims 4 studio no. :( 
I tested it, and it's also bad in the game.

I thought the normals was messed up but they are correct, I tried importing without making the backfaces, but it didn't work. I tried "merge by distance" to see if there was an error in the mesh (double vertices), but it is perfect. I don't know what to do anymore.

I tried to import another hair that I made in the blender, and it also had the same triangulated appearance. I tried importing it into milkshape and it's perfect there too. :* I do not know what else to do.