Object rotates on its side on play

Hi, I have been making this game where you drive your car around a planet, I use gravity to attract the car to the planet, but the problem is when I press play my car turns on its side, why is this happening?

Here is the planet script:

 public class planetScript : MonoBehaviour
 {
    
    public float gravity = -12;
    void Start(){
    GetComponent<Rigidbody>().constraints = RigidbodyConstraints.FreezeAll;
   
    }
     
    public void Attract(Transform playerTransform){
        Vector3 gravityUp = (playerTransform.position - transform.position).normalized;
        Vector3 localUp = playerTransform.up;
 
        playerTransform.GetComponent<Rigidbody>().AddForce(gravityUp * gravity);
 
       Quaternion targetRotation = Quaternion.FromToRotation(localUp,gravityUp) *  playerTransform.rotation;
       
        playerTransform.rotation = Quaternion.Slerp(playerTransform.rotation, targetRotation, 10f * Time.deltaTime);
    }
    
 }

And here is the car gravity script:

 public class playerGravity : MonoBehaviour
 {
     public planetScript attractorPlanet;
     private Transform playerTransform;
     void Start()
     {
         GetComponent<Rigidbody>().useGravity = false;
         GetComponent<Rigidbody>().constraints = RigidbodyConstraints.FreezeRotation;
       
 
         playerTransform = transform;
         
         
     }
 
         void FixedUpdate()
     {
         if(attractorPlanet){
             attractorPlanet.Attract(playerTransform);
         }
     }
 }