So I found a bug using the start location as “Highland Sprint”, in which, when entering the route creator, the original route is loaded simultaneously as the route creator is, making it impossible to place checkpoints accurately, or even see where they’re being placed.
I have had this issue 100% of the time, and I was in the Hall of Fame and had completed the event prior to entering the EventLab.
I can’t figure out how it was caused but I don’t have this issue at other starting locations. I am on a base Xbox One if that helps, can’t speak for other platforms.