Maybe you've made the same mistake I did, allthough it was with regards to Google Earth as compared to my GPS coords.
Check if the coords are listed as Degrees:Minutes,Seconds or Degrees:Minutes, decimal minutes.
For instance: 56 08'11.52" N 10 11'44.39" E (Degrees, minutes, seconds)
can also be written as 56 08.859' N 10 11.741' E (Degrees, Decimal minutes)
As you can see, the coords resemble each other quite a bit at first glance. But taking a closer look you will detect the discrepancy that you have also noticed.
I hope it helped.