Spline mesh hasn't a unique collision, but it has collision for every single mesh

Hi I build a racetrack using the spline system, the spline mesh is a simple rectangle that is used through all the spline, the problem is that the spline hasn’t a fluid collision, but it has a collision for every single piece of the mesh so my charachter keep glitching between each piece of the mesh, that specially happens downhill and going on a hill, I’ll post a video and a screenshot of my code: