Shading on a wall interrupted

Hi People

So have used boxes as walls. And some of them just dont render with the right shading on it.
Here an example:

These are two of those boxes with the same material and an alignement of surface planar on these sides. The texture is somehow fine but the rest not. The walls are created with alt draging in the direction the wall continues. I can’t make one wall out of it because the other sides need to have diffrent materials on each wall.

Is this BSP or Static meshes? how is the shader set up? did you rebuild lighting?
Please provide as much information as possible!

I did
-Build the lighting
-Tested every lamp type (Static, Stationary and Moovable)
-Its BSP
-With the setup of the shader, I dont have anything custom to this. I use normal lightmass.

Well, first of all, you shouldn’t use bsp for geometry… bsp should only be used for blocking out.
that said, have you tried increasing the light-map value?

I did once, but I changed it back later to 32.0

Try setting it to 16 or 8?