1st of all: Of course I fully agree to previous hints not to use tracks to copy routes from kurviger to kurviger. But this topic might concern also the import of tracks from the Web or from other applications.
It was easy to force such an “error” by shifting a waypoint manually, #54 in https://kurv.gr/5QwBL
On my tablet I have to zoom in to max. to see the cause (screenshots attached below): It seems, that the route passes (and ignores) the turn point to reach WP54, then does a U-Turn on WP54 and then arrives at turn point - and now has to turn right.
Perhaps it would be useful to keep some distance between WPs and turn points when importing a track and finding WPs - for using tracks out of the Web or from other apps.