sounds like the light guide isn't aligned properly, thats the transparent piece of plastic that looks like a spider. basically it works a little like a fibre optic and directs the light from the bulb to each of the heater dials and panel.
mine looks like this, some parts are brighter than other, but in real life it's all illuminated, if you have aircon, theres a blanking plate behind the 'air conditioning' part on the panel which can be removed so that the words illuminated aswell.
