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When did you get them mounted? If it was less than a day before the track day, maybe the lube the tire busters used wasn't dried and it allowed the tire to rotate on the rim. Although I have to say that I've had tires mounted the same day (sometimes only an hour before I was on track) and never had a problem.
How about the paint on those wheels? Were they painted with no tires on them, and the paint is on the part of the wheel that contacts the tires (but that would only be on one side)?
Just trying to come up with reasons your tires moved on the wheels.
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