Incorrect fog behavior on JAMP engine

[cookie jar]

Screen 1 - fog on OpenJK engine.

Screen 2 - fog on JAMP engine, also this warning in the console.

Fog shader looks like this:

textures/fogs/silentfog
{
	qer_editorimage	textures/fogs/fog.tga
	surfaceparm	nonsolid
	surfaceparm	nonopaque
	surfaceparm	fog
	fogparms	( 0.89 0.89 0.89 ) 4000.0
}

textures/fogs/silentfog_border
{
	qer_editorimage	textures/fogs/fog.tga
	surfaceparm	nonsolid
	surfaceparm	nonopaque
	surfaceparm	fog
	fogparms	( 0.89 0.89 0.89 ) 200.0
}

Anyone know what may cause this?

edit: Deleted the skyParms value in skybox shader and it fixed it for some reason