I see this all the time in our PT clinic, and 99% of the time it’s the right foot. I have an unproven theory about that: Maybe driving with your right foot externally rotated all the time has something to do with it. Next time you have your foot on the gas pedal, check out your foot position. Maybe driving with straight feet will help. (It worked for me.) Smashing the glute medius and squatting with neutral feet should also help, as will developing stance awareness, as Kaitlin suggested.