Проблемма с персонажем

rb.AddForce(Vector2.up * jumpForce, ForceMode2D.Impulse);

public class PlayerController : MonoBehaviour
{
    public float speed = 20f, jumpForce,moveInput;
    private Rigidbody2D rb;
    private bool isGround;
    public Transform groundCheck;
    public float checkRadius;
    public LayerMask whatIsGround;
    private int extraJump;
    public int extraJumpValue;
 
 
    
    // Start is called before the first frame update
    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
        extraJump = extraJumpValue;
 
       
    }
 
    // Update is called once per frame
    void Update()
    {
        flip();
        float moveX = Input.GetAxis("Horizontal");
        rb.MovePosition(rb.position + Vector2.right * moveX * speed * Time.deltaTime);
 
        if (isGround == true)
            extraJump = extraJumpValue;
 
        if (Input.GetKeyDown(KeyCode.Space) && extraJump > 0)
        {
            rb.AddForce(Vector2.up * jumpForce, ForceMode2D.Impulse);
            //rb.AddForce(Vector3.up * jumpForce * Time.deltaTime);
            //rb.MovePosition(rb.position + Vector2.up * jumpForce * Time.deltaTime);
            //rb.velocity = Vector2.up * jumpForce;
            extraJump--;
        }
        else if (Input.GetKeyDown(KeyCode.Space) && extraJump == 0 && isGround == true)
            rb.AddForce(Vector2.up * jumpForce, ForceMode2D.Impulse);
        //rb.velocity = Vector2.up * jumpForce ;
        //rb.MovePosition(rb.position +   * jumpForce * Time.deltaTime);
        if (Input.GetKeyDown(KeyCode.Escape))
        {
            
        }
    }
 
    private void FixedUpdate()
    {
         isGround = Physics2D.OverlapCircle(groundCheck.position, checkRadius, whatIsGround);
        rb.velocity = new Vector2(Input.GetAxis("Horizontal") * 12f, rb.velocity.y);
 
    }
 
    void flip()
    {
        if (Input.GetAxis("Horizontal") > 0)
            transform.localRotation = Quaternion.Euler(0, 0, 0);
 
        if (Input.GetAxis("Horizontal") < 0)
            transform.localRotation = Quaternion.Euler(0, 180, 0);
    }
}

rb.MovePosition(rb.position + Vector2.right * moveX * speed * Time.deltaTime);

rb.velocity = new Vector2(Input.GetAxis("Horizontal") * 12f, rb.velocity.y);