It's from spinning the track on gravel. I see people do that all the time. In the parking lot, going up hills with a foot of snow, plowing the drive way. Well maybe not the last one.
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The middle insert between the two coolers seems to be of softer aluminum on the new pro's vs. the IQ chassis. This is what I believe the issue is.
Same aluminum... The Pro RMK just has a much wider center section between the coolers.
IMO...If it really bugs you... rivet a section 1/8" HDPE or UHMW down the center section between the coolers in the rear... If you do it carefully it will look "factory installed" and not detract from the sled.