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The MTB Project map for Bean Peaks, south of Prescott, in Arizona shows an elevation of 21222 feet.
Bean Peaks elevation is 6486 ft.
One theory for the mistake is if you miss-interpret the 6486 as meters and convert it to feet, then you get close to 21222 feet. Another metric conversion mess.
funny - that's actually an error in the base layer code from a third-party supplier we use called mapbox. It doesn't seem widespread. I've let them know the exact error and hopefully they'll fix it. Thanks!