[2020] [Bug/Glitch]Posible editor bug with start/finish block

Hi,

I'm not really sure if this is a bug or just me being really stupid but I have a map that is ready for validation. It's a looping track with one lap only. I have the start/finish in place, a couple of checkpoint but the game won't let me validate this track. The validation flag is red and says 'you can place only one starting point'. I'm pretty sure I don't have any other starting points in place other than the start/finish. I scanned the stadium but found nothing. What's even weirder is that if I place a regular start in addition to the already-placed start/finish, the validation flag suddenly turns green. What's happening? Please don't tell me the map is bugged and lost - I worked on it the last 3 days.

Thanks for your help and feedback.