strange routing

In this route:

https://abetterrouteplanner.com/?plan_uuid=1ffb5d54-1ad6-457c-ad43-3404eb466734

The offered routes are very much longer than they should be, because they do not use the obvious road between the source and destination.

All within Norway.

Source = Vossevangen Legensenter

Destination = Lom, Sognefjellsvegen

The best route would go North-East via Ovre Ardal for about 4 hours of journey (according to Google maps), but the ABRP route goes due North, takes a ferry(!) and eventually goes East, taking about 6 hours.

There’s a stretch of road the routing algorithm really wants to avoid. For example:

https://abetterrouteplanner.com/?plan_uuid=1ffb5d54-1ad6-457c-ad43-3404eb466734