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The electrical contact base in the bulb housing is spring loaded to ensure proper contact with the bulb elements. The little base "floats" inside a slot. That "floating" base can be turned 180 degrees around so that the effect is that the wire leads are now opposite from what you expect them to be. When I wired my car, I assumed that all of the lamps were wired the same. I tested one lamp on a battery to determine which wire was for the turn signal, or brake lamp(brighter element) and which one was for the running lamp (dimmer element). As it turned out, they where not all the same (2 out of 6 where different). To fix the problem I just switched and rewired the leads on the two wrong bulb housings.
It may be possible that your car has always been incorrectly wired or that when replacing the bulb, the "floating" base got reversed.
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