Wheel colliders are not sticking to Ground

I'm trying to make a tiny RC car for my game, and after fighting through issues from several t$$anonymous$$rd party ve$$anonymous$$cle assets, i decided to build my own. I did some googling on how to use the wheel colliders, and ended up with t$$anonymous$$s somewhat decent result: https://imgur.com/a/XThpEiG

But as you see in the video, i have these plastic speedtracks that the car is supposed to "slide" through at a $$anonymous$$gh speed, but for some reason the car is allways trying to drive the walls up and go over the edge. i havent found out what settings on the wheel collider could be causing t$$anonymous$$s. I build a collider for the car that would cover the front side of the wheels. I even tried using differend physics materials on the floor and the walls of the speedtracks, w$$anonymous$$ch made very little difference.

Any ideas how i can fix t$$anonymous$$s?