My Player rotates on the Z axis, but not the X axis. Why?

Here is my whole PlayerController C# Script, with it the player can be moved, and it also makes him hover over the ground (It's supposed to be a futuristic bot).

 using UnityEngine;
 using System.Collections;
 
 public class HoverBot : MonoBehaviour
 {
 
     public float speed = 90f;
     public float turnSpeed = 5f;
     public float hoverForce = 65f;
     public float hoverHeight = 3.5f;
     private float powerInput;
     private float turnInput;
     private Rigidbody carRigidbody;
 
 
     void Awake()
     {
         carRigidbody = GetComponentInParent<Rigidbody>();
     }
 
     void Update()
     {
         powerInput = Input.GetAxis("Vertical");
         turnInput = Input.GetAxis("Horizontal");
     }
 
     void FixedUpdate()
     {
         Ray ray = new Ray(transform.position, -Vector3.up * 10f);
         RaycastHit hit;
 
         if (Physics.Raycast(ray, out hit, hoverHeight))
         {
             float proportionalHeight = (hoverHeight - hit.distance) / hoverHeight;
 
             Vector3 appliedHoverForce = Vector3.up * proportionalHeight * hoverForce;
 
             carRigidbody.AddForceAtPosition(appliedHoverForce, transform.position);
 
             transform.rotation = Quaternion.RotateTowards(transform.rotation, Quaternion.LookRotation(transform.forward, hit.normal), 100f * Time.deltaTime);
             Debug.Log(hit.normal);
             
             Debug.DrawLine(transform.position, transform.position + appliedHoverForce/100f, Color.red);
         }
 
         carRigidbody.velocity = new Vector3(turnInput * turnSpeed, 0f, powerInput * speed);
 
     }
 }

My problem is that normally the player rotates automatically to always be parallel to the ground he's hovering above (if he detects a ramp beneath him, he rotates to be parallel to it, which makes it more ergonomic to climb it).

But the Player only rotates on the Z axis, if he tries to climb a ramp on the X axis, thanks to the Debug, I know he detects it, but he does not rotate, why?

Thanks for your time!