As you can see in the picture, the wall model isn't lighting right, it seems to be either lit or not, the one on the left isn't, Models don't seem to light as if they were brushes, as in light up certain amount at different bits of model in relation to distance from light. This happens with waw AND ported models, and in cases like this, looks plain ugly

Any fixes for it?

I might sound stupid but if you press control + L or shift L it should bring up the thing to change lighting. Try doing it to the wall. I'm not 100% sure if it will work as I'm fairly new to map making but this helped me sort out some weird lighting