Персонаж прыгает в воздухе

 using System.Collections; 
using System.Collections.Generic; 
using System.Security.Cryptography; 
using UnityEngine; 
 
public class Character : MonoBehaviour { 
 
    [SerializeField] private float speed = 3f;   //скорость персонажа 
    [SerializeField] private int lives = 5;  //здоровье персонажа 
    [SerializeField] private float jumpForce = 1.5f;   //сила прыжка персонажа 
    private bool isGrounded = false; 
 
    private Rigidbody2D rb; 
    private Animator anim; 
    private SpriteRenderer sprite; 
 
    private States State 
    { 
        get { return (States)anim.GetInteger("state"); } 
        set { anim.SetInteger("state", (int)value); } 
    } 
 
    private void Awake() 
    { 
        rb = GetComponent(); 
        anim = GetComponent(); 
        sprite = GetComponentInChildren(); 
    } 
 
    private void Update() 
    { 
        if (isGrounded) State = States.idle; 
 
        if (Input.GetButton("Horizontal")) 
            Run(); 
        if (Input.GetButtonDown("Jump")) 
            Jump(); 
    } 
 
    private void Run() 
    { 
        if (isGrounded) State = States.go; 
 
        Vector3 dir = transform.right * Input.GetAxis("Horizontal"); 
        transform.position = Vector3.MoveTowards(transform.position, transform.position + dir, speed * Time.deltaTime); 
 
        sprite.flipX = dir.x < 0.0f; 
    } 
 
    private void Jump() 
    { 
        rb.AddForce(transform.up * jumpForce, ForceMode2D.Impulse); 
    } 
 
    private void CheckGround() 
    { 
        Collider2D[] collider = Physics2D.OverlapCircleAll(transform.position, 0.3f); 
        isGrounded= collider.Length > 1; 
 
        if (!isGrounded) State = States.jump; 
    } 
} 
 
public enum States 
{ 
    idle, 
    go, 
    jump 
}