Anyone keeping track with the Runkeeper app?

I just tried it this morning on my brand new Ipod touch but the thing added 4 kms to my usual distance!
I checked on the Runkeeper map when I got to work and according to RunKeeper I kept jumping from one side of the Yamaska river to the other all the way to work

Not impressed so far.

As anybody experienced the same kind of problem with runkeeper?

Thanks.