I fly, why?,I fly why?

I fly up when i look and press a movement key. But i dont want to go up. I just want a normal walking script Heres mine. public class PlayerMove : MonoBehaviour { public float moveSpeed = 2.0f; public Transform playerBody; public Transform mainCamera; public CharacterController controller;

     // Update is called once per frame
     void Update()
     {
         KeyboardMovement();
     }
     void KeyboardMovement()
     {
         float x = Input.GetAxis("Horizontal");
         float z = Input.GetAxis("Vertical");
         Vector3 sidewaysPos = Camera.main.transform.right;
         Vector3 forwardPos = Camera.main.transform.forward;
         Vector3 move = sidewaysPos * x + forwardPos * z;
         transform.Translate(move * moveSpeed * Time.deltaTime);
     }
 }

,I want a normal movement script. I've kinda made my own because the other ones wouldn't work. But whenever i look up iand press w (any movement key) I go in the air. I want to fix this but idk how.

Heres my code public class PlayerMove : MonoBehaviour { public float moveSpeed = 2.0f; public Transform playerBody; public Transform mainCamera; public CharacterController controller;

 // Update is called once per frame
 void Update()
 {
     KeyboardMovement();
 }
 void KeyboardMovement()
 {
     float x = Input.GetAxis("Horizontal");
     float z = Input.GetAxis("Vertical");
     Vector3 sidewaysPos = Camera.main.transform.right;
     Vector3 forwardPos = Camera.main.transform.forward;
     Vector3 move = sidewaysPos * x + forwardPos * z;
     transform.Translate(move * moveSpeed * Time.deltaTime);
 }

}