.rvmat shading bug

[Bombardyn 0]

Hi,
I am making a rhs retexture and tried to change the materials of the spcs vest. So i made a custom .rvmat file and assigned it to the new spcs vest. The problem is that it had a strange shading problem. I decided to assign the original .rvmat files to the vest in order to see, wheather the problem was in the new material textures or in the code. The shading bug is still there and i have no idea why. Do you guys have an idea why the shading bug occurs?

    class test__spcs_ocp_squadleader: rhsusf_spcs_ocp_squadleader
    {
        displayName = "test";  
        hiddenSelections[]={"camo","camo1","camo2","camo3","camo4"};
		hiddenSelectionsMaterials[] = {"rhsusf\addons\rhsusf_infantry\data\rhs_spcs_01.rvmat","rhsusf\addons\rhsusf_infantry\gear\vests\data\rhs_vest_iotv2.rvmat","rhsusf\addons\rhsusf_infantry\gear\vests\data\rhs_vest_iotv3.rvmat","rhsusf\addons\rhsusf_infantry2\gear\vests\mbav\data\mbav_gear.rvmat","rhsusf\addons\rhsusf_weapons\grenades\m18\data\m18_green.rvmat"};
	};