Delete all player waypoints.
Never, under any circumstances whatsoever, use player waypoints. (If you want, when your mission is finished, you can put some in as guidance for players in Cadet mode.) It leads to a whole world of trouble. For a start, players in Veteran mode can't see them, so the mission will be non-functional. Even in Cadet mode players can screw things up, and they may not want to do exactly what the waypoint says anyway.
Oh, and you should be playing in Veteran mode anyway. It's MUCH more fun than Cadet. Nobody who switches to Vet ever switches back. Do you like it when your parents tell you what to do? Because that's all Cadet mode is.