roll a ball with rotating camera script. when i go back the ball fly

when i use S key in my game ball start flying when i used a script that rotate camera around ball ( with mouse ) this happend ps: this script change WASD , so W always be forward of ball

so anyone can see what is the problem? this is my script:

Camera script

 using UnityEngine;
 using System.Collections;
 
 public class Camera2 : MonoBehaviour
 {
 
     public Transform target;
 
     // Exposed vars for the camera position from the target.
     public float height = 20f;
     public float distance = 20f;
 
     // Camera limits.
     public float min = 10f;
     public float max = 60;
 
     // Rotation.
     public float rotateSpeed = 1f;
 
     // Options.
     public bool doRotate;
     public bool doZoom;
 
     // The movement amount when zooming.
     public float zoomStep = 30f;
     public float zoomSpeed = 5f;
     private float heightWanted;
     private float distanceWanted;
 
     // Result vectors.
     private Vector3 zoomResult;
     private Quaternion rotationResult;
     private Vector3 targetAdjustedPosition;
 
     void Start()
     {
         // Initialise default zoom vals.
         heightWanted = height;
         distanceWanted = distance;
 
         // Setup our default camera.  We set the zoom result to be our default position.
         zoomResult = new Vector3(0f, height, -distance);
     }
 
     void LateUpdate()
     {
         // Check target.
         if (!target)
         {
             Debug.LogError("This camera has no target, you need to assign a target in the inspector.");
             return;
         }
 
         if (doZoom)
         {
             // Record our mouse input.  If we zoom add this to our height and distance.
             float mouseInput = Input.GetAxis("Mouse ScrollWheel");
             heightWanted -= zoomStep * mouseInput;
             distanceWanted -= zoomStep * mouseInput;
 
             // Make sure they meet our min/max values.
             heightWanted = Mathf.Clamp(heightWanted, min, max);
             distanceWanted = Mathf.Clamp(distanceWanted, min, max);
 
             height = Mathf.Lerp(height, heightWanted, Time.deltaTime * zoomSpeed);
             distance = Mathf.Lerp(distance, distanceWanted, Time.deltaTime * zoomSpeed);
 
             // Post our result.
             zoomResult = new Vector3(0f, height, -distance);
         }
 
         if (doRotate)
         {
             // Work out the current and wanted rots.
             float currentRotationAngle = transform.eulerAngles.y;
             float wantedRotationAngle = target.eulerAngles.y;
 
             // Smooth the rotation.
             currentRotationAngle = Mathf.LerpAngle(currentRotationAngle, wantedRotationAngle, rotateSpeed * Time.deltaTime);
 
             // Convert the angle into a rotation.
             rotationResult = Quaternion.Euler(0f, currentRotationAngle, 0f);
         }
 
         // Set the camera position reference.
         targetAdjustedPosition = rotationResult * zoomResult;
         transform.position = target.position + targetAdjustedPosition;
 
         // Face the desired position.
         transform.LookAt(target);
     }
 }

Player Control Script

 using UnityEngine;
 using System.Collections;
 
 public class playercontroller2 : MonoBehaviour
 {
     public float speed;
     private Rigidbody rb;
     void Start()
     {
         rb = GetComponent<Rigidbody>();
         
     }
     // Use this for initialization
     void FixedUpdate()
     {
         float moveHorizontal = Input.GetAxis("Horizontal");
         float moveVertical = Input.GetAxis("Vertical");
 
         Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);
  
        movement = Camera.main.transform.TransformDirection(movement);
        rb.AddForce(movement * speed * Time.deltaTime);
     }
 }

so to be clear, when i use this scripts, when i use back ( S or down arrow ), the ball start fly backward but i dont have this problem with other directions so anyone know the problem?