Garmin Forerunner 35 showing correct distance after a run but missing parts on the route map. Then once sync'd to Strava it had missed the distance off the data AND map. 5.05k became 3.54k (it missed the first 1.5k off the start) It must have connected to GPS to recognise the distance on Garmin. This happens on both my daughters watches bought for Christmas 2020. Please help