Found a small bug, maybe it is already known.
As told, I was running a course a few days ago. Had it properly unselected after the run and today, I ran (partially) on the same route.
Had the map displayed and was wondering that a partial subset of the route (maybe 2km or so) was displayed on the map. Checked settings and route was not selected. Checked it and unchecked it but the route stayed on the map. Changed screens, route stayed.
Coming back home, I deleted the route and checked "Map only". Still, the segment (including direction arrows) was on the map. Force quit WOD and checked again, and now, partial route was gone. Not a big issue, of course.