Matt - did you get this resolved? I see Scott didn't respond, so hoping you got your issue resolved?
If the switch is to the left - i.e. should come on when doors are opened - the lights are on all the time - regardless of if the button is pressed in or not or you shut the doors (only go off when you lock the van) . All three lights come on, whereas if the switch is to the right the middle light does not come on on this setting.
My van has been converted to a Camper - I don't know the ins and outs of the electrics, but quite possibly this has caused the issue, but then again if other people like yourselves have had the same issue perhaps there is an issue regardless of conversion.
Thanks.