What if an App tracks something erroneously?

If one of the third-party apps (Garmin, MapMyRun, Fitbit, etc) tracks something erroneously, you can just delete the activity in the app, which will then sync the delete to Challenge Hound, then manually enter it into Challenge Hound with the correct parameters. You can also try to adjust the activity in the app, however that functionality varies by app and isn't always possible.