Everytime I login to Xert, the population rankings on the My Fitness page change drastically. Also I’ve noticed that they are always at some interval. Today they were in 1/3 intervals, 100%, 66.7%, 33.3%. Yesterday they were in fifth, 20,40,60 etc.
The rankings may change depending on the date range and the population that is being compared to. These settings are saved locally on a computer, so you might see differences in the rankings when checking from different devices if the data range or population comparison are not the same. We may take a look into the athlete rankings and see if we can find anything.