Hi,
Make sure the waypoints have got an equal distance from their respective “next” waypoint. You could also test Tej’s solution. If your game doesn’t look and feel good with the Circuit, I would recommend not to spend too much time on making your game look perfect with the Circuit because Rick is going to replace it with a Timeline animation in a later video.
Hopefully, this helped. 
See also:
- Forum User Guides : How to mark a topic as solved