Same duplicate prefab not work.

Hi! I have a arrow trap, when the player collider collision with the trap collider, the trap is activate and throw one arrow, but if i put two arrow traps prefabs, only work one. Where is the problem? Thanks.

 public class ArrowTrap : MonoBehaviour {
 
     public static ArrowTrap Instance;
 
     public float speed;
     public GameObject arrowPrefab;
     public Arrow arrowScript;
     BoxCollider2D boxCollider2D;
 
     void Start()
     {
         Instance = this;
         GameObject g = GameObject.FindGameObjectWithTag("arrow");
         boxCollider2D = GetComponent<BoxCollider2D>();
         arrowScript = g.GetComponent<Arrow>();
     }
 
     void OnTriggerEnter2D(Collider2D col)
     {
         if (col.transform.tag == "Player")
         {
             arrowScript.arrowTriggered = true;
             Debug.Log("TRIGGER WORK");
             boxCollider2D.enabled = false;
         }
     }
 }

 public class Arrow : MonoBehaviour
 {
     public static Arrow Instance;
 
     public float speed;
 
     GameObject player;
     Rigidbody2D rb2d;
     Vector3 dir;
     Animator anim;
     int arrowDmg;
     BoxCollider2D boxCollider2D;
     public SpriteRenderer arrowObj;
 
     public Player playerScript;
     void Start()
     {
         Instance = this;
         player = GameObject.FindGameObjectWithTag("Player");
         rb2d = GetComponent<Rigidbody2D>();
         arrowDmg = 1;
         boxCollider2D = GetComponent<BoxCollider2D>();
         anim = GetComponent<Animator>();
         arrowObj = GetComponent<SpriteRenderer>();
 
         GameObject g = GameObject.FindGameObjectWithTag("Player");
         playerScript = g.GetComponent<Player>();
     }
 
     public bool arrowTriggered = false;
     void FixedUpdate()
     {
         if (arrowTriggered == false)
         {
             rb2d.constraints = RigidbodyConstraints2D.FreezeAll;
         }
 
         if (arrowTriggered == true)
         {
             rb2d.MovePosition(transform.position + (dir * speed) * Time.deltaTime);
 
             // Lanzar flecha
             if (player != null)
             {
                 dir = (new Vector2(0, -1)).normalized;
                 print("SHOOT ARROW");
                 rb2d.constraints = RigidbodyConstraints2D.FreezeRotation;
             }           
         }
     }
 
     void OnCollisionEnter2D(Collision2D col)
     {
         if (col.transform.tag == "Player")
         {            
             playerScript.vulnerability = true;
             Player.instance.CallFlashCoCoroutine();
             anim.SetBool("destroy", true);
             arrowTriggered = false;
             Health.Instance.health -= arrowDmg;
             boxCollider2D.enabled = false;
             Debug.Log("ARROW COLLISION PLAYER");
 
         }
 
         if (col.transform.tag == "wallsArrow")
         {
             anim.SetBool("inWall", true);
             arrowTriggered = false;                       
             Destroy(boxCollider2D, 0.01f);            
             arrowObj.GetComponent<Renderer>().sortingLayerName = "LevelDown";
             Debug.Log("ARROW IN WALL");
         }
     }
 }