Differences in walking routes between Resrobot Sok Resa API and Resrobot website

Hello!
I'm building a public transport routes using both ResRobot API and Resrobot website. I've noticed that there are major differences in parts of the root that should be walked by foot.
For example, a route from Göteborg Centralstation to Myrbostigen 35, Göteborg (arrival at 8 AM, Monday).
Resrobot website (http://reseplanerare.resrobot.se/bin/query.exe):

1. 07:23 - 07:49 Västtrafik Buss Röd E Towards: Lilla Varholmen (Göteborg kn)
2. 07:49 - 08:06 Walk 17 min., ca. 1,3 km
   

And the Resrobot Sok Resa API ("from" coordinates are the exact coordinates of the Göteborg Centralstation in Resrobot, and "to" coordinates I received with google places api for the example address):

1. 07:23 - 07:49 Västtrafik Buss Röd E Towards: Lilla Varholmen (Göteborg kn)
2. 07:49 - 07:57 Distance: 567

The full JSON response can be found here http://pastebin.com/mFyJfq0B

Why is there such a big difference in the last part of the route? I'm sure that coordinates of the destination point returned by google are close enough to the ones that are stored on the Resrobot Website database.