yes, you can do it that way or you can delete file vehicle_profiles.xml when Navigator is closed folder android/data/com.mapfactor.navigator/files/navigator/
Is that mapversion 44-201605040 or 4050 at the end? One my phone I have 4050 (I understand this is April) and it offers an update to 5030 (May). I wonder if they have to different maps for May.
Anyway, where you have the demitour my itinéraire has the waypoint listed, i have set manually somewhere after the crossing. I wonder, why i makes a u-turn instead of a waypoint....
A wonder still is, why a new car (profile) makes a left turn afterwards (instead a relatively short round trough the village as with your older car).
That route of yours: Did you create it yourself or did you import it from another program?
If you created it yourself: how did you do that? Searching for places by address? Or putting waypoints along the road?
If you imported a route: please share it with us. (I'm almost sure you imported it from another program). The names simply don't fit with Navigator which means that they come from something else.
I do have the same problem. I create routes for biking, convert them using RouteConverter and import them into Navigator. It then creates the exact same kind of weird loops.