Gear Fit - measure distance up to double actually travelled

[kev0619]

While either cycling and/or walking my gear fit is measuring up to double the distance i have actually travelled. Based upon the distance travelled measured by S-Health I rode 24.2 km. The distance shown on my gear fit is 38.51 which is almost 15.0 km more than I actually did. I have the same problem if I go for a walk, the path I take is 3.33 km from end to end. when I reached the end my gear fit shows 6.34. On at separate note when I get my gear fit to measure my heart rate after I finish my ride, the heart rate shows the same measurement as when I first started.
I was wondering if anyone else has had the same problem and if they know how to fix it.?