See attached screen dump from viewing this mornings livetrack (browser is Chrome 68 on Windows 10). I changed units display at bottom right of the window from statute to metric, but the distance balloons on the map track are a mixture of statute and metric. The 5, 10, and 15 distances are all miles, then the next balloon is for 30km, then the next one 20 miles, then 35km, then 40km and 25 miles in quick succession. Zooming the map in or out and panning it around makes no difference to this - the balloons remain the same.
Presumably a bug in the livetrack website code, but there doesn't appear to be any forum covering that.
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