I also use Map My Run to log my runs. The Whoop map is always giving me much higher elevation gains than the Map My Run app. For example, today, MMR said it was 259 feet elevation gain and Whoop said it was 1,057 feet. I know MMR is correct.
Also last month I did a beach walk. Sea level the entire time. The Whoop map said I had 325 foot elevation gain.
Does anybody else find this same issue?