Parts wont interact correctly

[Elvinwoman (vtex)]

I have a model that is supposed to fit into a track I made, but the model just seems to float over it instead of fitting in, does anyone know why?

(info: Vehicle above is tagged Massless, track is anchored, vehicle isn’t, and the parts under the vehicle are a union, not separate parts)

[grimmerschool2 (FestiveGrim)]

This is the problem:

@Elvinwoman

and the parts under the vehicle are a union

Unions usually have weird collision hitboxes.