.ybn collisions issue

Hey,
i’m trying to match two MLOs that are in the same .ybn and .ymap files. I figured out .ymap using codewalker, but when I’m trying to edit collisions using 3ds max they are not working in game. I deleted useless collisions, exported it via GIMS Evo, but they are still visible in OpenIV. After importing same file to the 3ds max the collisions aren’t there. What am I doing wrong?


image

Possibly inverted normals?