Today I convinced someone else to start using MNF. After downloading and map install I wanted to set correct road speeds for the car profile as MNF is way too optimistic.
I changed both speeds per road but apart from motorways I did not touch the priority setting of 50%. With all changes however the priority was always set to 51%.
I immediately tried my own phone but also there the priority is "magically" and incorrectly set to 51.