Navigation error

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I want to travel from Åndalsnes (Norway) to Valldal (Norway) via the Trollstigen. Even though I have forced the algorithm to use Trollstigen (by inserting multiple checkpoints), it insists on routing back and circling around. See the pic for more info.

https://abetterrouteplanner.com/?plan_uuid=241af8f6-59bd-49b0-b65c-dca81f2ae069