Bullet destroy 2 game object intent one unity 2D

Unity Engine
1

When my bullet Collides with a Ball if there is 2 Balls at near or at the same position, all object get destroyed at same time. I set in my script when bullet collide with other then player it will be destroy.

I was trying to check every ball type with else if

if(other.gameObject.tag == "yerrow")
    {
        if (ballType >= 0 && ballType < 4)
        {

            clone1 = (GameObject)Instantiate(_ball, gameObject.transform.position, Quaternion.identity);
            clone1.gameObject.GetComponent<Balloon_Behave>().ballMove = -4;
            clone1.gameObject.GetComponent<Balloon_Behave>().transform.position = new Vector2(transform.position.x - Random.Range(0, 0.5f), transform.position.y - Random.Range(0,1));

            clone2 = Instantiate(_ball, gameObject.transform.position, Quaternion.identity);

            Destroy(this.gameObject);
        }
        else if (ballType == 4)
        {
            Destroy(this.gameObject);
        }
        Debug.Log("Yerrow COLl");
    }
Yerrow Script Destroy himself

  private void OnTriggerEnter2D(Collider2D other)
      { 
         if (other.gameObject.tag != "Player")
          {
             Destroy(this.gameObject);
             player.CanFire = true;
          }
      }
EDIT NOTE : Every ball collides with bulled is destroy intent one. I want to destroy one object by one bullet
2

I use a boolean to avoid this, for instance if your bullet has a bool called hit and it is initially set to false when you call your onTriggerEnter check if hit == false then destroy. Then obviously set it to true so the next object to hit it will not be destroyed

3

Did you check the Ball’s collider size? Does it match the sprite?