The blue hue indicates the tire(s) have been near or over their maximum operating temperature. It is not unheard of if some of the tracks you visit have long sweepers in one direction only. For example, since we haven't visited Willow Springs International Raceway in over 2 years, my front right is starting to wear more than the left due to the long, massive banked oval portion of California Speedway (and the 1 day we visit Buttonwillow isn't going to counter that effect).
Since the tires appear directional, I would just mount them inside out and swap left and right every 2-5 events to maintain even wear, especially if the wear is caused by long high speed sweepers in one direction only.
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