Cars not spawning where they should

I have Created a custom time trial (quickrace) on a map. i tried to solve this issue myself but i can't seem to figure it out.
I looked on some official Beamng maps and the cars spawn at certaint checkpoint, example: "asphalt_mix_standing_spawn" on utah.
I also created a checkpoint, named it, and set the quickrace start to that checkpoint, though the cars still spawn on the 0 point on each axis.
i am new to this topic so please go easy on me, thanks!