I have a vivosmart hr, bought it about 3 months ago and have been super satisfied, but today I was running with a friend and found out while my watch records a 6km run, her phone records for the very same track 4.3km. Now that's a huge difference and made me second guess all my trainings now. I did drive around the track to check if her phone might have been the problematic one or if the difference wasnt as big, and to my surprise got the same 4.3km. Can it be fixed? Ptherwise, what's the point in tracking something so off .. help anyonem please!!