hey guys i just gor a precious and when i was trying it out right off at about 1 ft away from the start the car would just about to fall of my table which is like 2 feet wide and when my brother tried his he got to about 2 feet way from where i was about to fall off do u know what's wrong or that i can do to fix it?

i opened it up and didn't see anything wrong but then again i'm not exactly sure what that whole middle white piece does

well thanks for the help guys