This *sounds* like you have 12v permanent (yellow wire) wired to your accessory line and 12v switched (orange wire) connected to your permanent feed.

Nothing will happen when you turn the lights on unless you set a different dimmer level. Turn the lights on and then go to the dimmer menu, set a lower dimmer level. Now turn the lights off - the display should go back to 100% (or whatever you had it set to last time the lights were off).

Hugo