If you have a personal record from faulty data that you do not wish to count as a personal record; whether you recorded a ride as a run, ran a mile straight downhill, etc., you are able to ignore the record from being listed as your actual personal record at any given distance in the COROS app.
Simply navigate to your Personal Record page from the Profile page, swipe left on the record you wish to ignore, and ignore it. This will not delete the recorded activity the record is from, it will simply not list it as your personal record, and the next fastest time at that distance will be listed.