Eau Rouge - your car sounds like it has had at some point a used ECU, code box & ignition barrel fitted, and the key that starts the car belongs to the car that the ECU etc came from. The other key is your car's original key that operates all the locks, but won't start the car because of the change of ECU & code box. I assume the brown master key opens the car doors but won't start the engine?
There wouldn't be much you could do unless you found the car your ECU came out of and took the door lock barrels, glove box lock, boot lock etc from. You could buy a whole new lock set, key set & ECU/code box from another breaker to get around the problem but it would be expensive, I'd suggest just putting up with it..
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