JoeGideon (8/14/2021)
In Unreal Engine, double click on the RL_HQSkin shader, you will get a pop up. Go to the details panel and scroll down to Tessellation, change the D3D11Tess from "PN Triangles" to "No Tessellation." This should get rid of the triangles.

Thank you very much. But the problem dissapeard without changing anything, i don't know why.
Now i am having another problem when i import skirts. Take a look. Maybe you know why. Because this make impossible to add cloth physics without deforming the skirt.