Why does my character constantly move forward and also at the start jump up into the air in a way?,Why does my character constantly go forward and goes up when starting ?

my character goes forward constantly and slightly goes up when i start my project in the game tab im using a third person movement script from this YouTube video: https://www.youtube.com/watch?v=4HpC--2iowE

I am not very good at coding at all and have almost no experience so sorry if i made a stupid mistake here is the code i got in the end: using System.Collections; using System.Collections.Generic; using UnityEngine;

public class ThirdPersonMovement : MonoBehaviour {

 public CharacterController controller;

 public float speed = 250f;

 public Transform cam;

 public float turnSmoothTime = 0.1f;
 float turnSmoothVelocity;
 void Update()
 {
     float horizontal = Input.GetAxisRaw("Horizontal");
     float vertical = Input.GetAxisRaw("Vertical");
     Vector3 direction = new Vector3(horizontal, -9.8f, vertical).normalized;

     if(direction.magnitude >= 0.1f)
     {

         float targetAngle = Mathf.Atan2(direction.x, direction.z) * Mathf.Rad2Deg + cam.eulerAngles.y;
         float angle = Mathf.SmoothDampAngle(current: transform.eulerAngles.y, targetAngle, currentVelocity: ref turnSmoothVelocity, turnSmoothTime);
         transform.rotation = Quaternion.Euler(0f, angle, 0f);
         
         Vector3 moveDir = Quaternion.Euler(0f, targetAngle, 0f) * Vector3.forward;
         controller.Move(moveDir.normalized *speed * Time.deltaTime);
     }
 }

}

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