I am trying to spawn multiple asteroids but only one is screen wrapping . Please help.

Spawner Script

public class AsteroidSpawner : MonoBehaviour { [SerializeField] GameObject asteroidPrefab;

 Asteroidbody astbody1;
 Asteroidbody astbody2;
 Asteroidbody astbody3;
 Asteroidbody astbody4;
 void Start ()
 {
     GameObject aster1=Instantiate<GameObject>(asteroidPrefab, new Vector3((ScreenUtils.ScreenLeft)/16, ScreenUtils.ScreenTop,-Camera.main.transform.position.z), Quaternion.identity);
     astbody1 = aster1.GetComponent<Asteroidbody>();   
     GameObject aster2 = Instantiate<GameObject>(asteroidPrefab, new Vector3((ScreenUtils.ScreenLeft) / 16, ScreenUtils.ScreenBottom, -Camera.main.transform.position.z), Quaternion.identity);
     astbody2 = aster2.GetComponent<Asteroidbody>();
     GameObject aster3 = Instantiate<GameObject>(asteroidPrefab, new Vector3(ScreenUtils.ScreenLeft, ScreenUtils.ScreenBottom/8, -Camera.main.transform.position.z), Quaternion.identity);
     astbody3 = aster3.GetComponent<Asteroidbody>();
     GameObject aster4 = Instantiate<GameObject>(asteroidPrefab, new Vector3(ScreenUtils.ScreenRight, ScreenUtils.ScreenBottom/8, -Camera.main.transform.position.z), Quaternion.identity);
     astbody4 = aster4.GetComponent<Asteroidbody>();
     astbody1.Initilise(Direction.Down);
     astbody2.Initilise(Direction.Up);
     astbody3.Initilise(Direction.Right);
     astbody4.Initilise(Direction.Left);
 }

}

Asteroid Body

public class Asteroidbody : MonoBehaviour { CircleCollider2D cc; float radius; float magnitude;

 void Start ()
 {
     cc = GetComponent<CircleCollider2D>();
     radius = cc.radius;
     
 }

 public void Initilise(Direction dir)
 {
     float angle = Random.Range(15, 45);
     if(dir == Direction.Left)
     {
         angle = angle + 180;
     }
     else
     {
         if(dir==Direction.Up)
         {
             angle = angle + 90;
         }

         else if(dir==Direction.Down)
         {
             angle = angle - 90;
             if(angle<0)
             {
                 angle = 360 + angle;
             }
         }
     }
     Vector2 direction = new Vector2(Mathf.Cos(angle * Mathf.Deg2Rad), Mathf.Sin(angle * Mathf.Deg2Rad));
     magnitude = Random.Range(2, 4);
     GetComponent<Rigidbody2D>().AddForce(direction * magnitude, ForceMode2D.Impulse);
 }

 void OnBecameInvisible()
 {
     Vector2 position = transform.position;

     // check left, right, top, and bottom sides
     if (position.x + radius < ScreenUtils.ScreenLeft ||
         position.x - radius > ScreenUtils.ScreenRight)
     {
         position.x *= -1;
     }
     if (position.y - radius > ScreenUtils.ScreenTop ||
         position.y + radius < ScreenUtils.ScreenBottom)
     {
         position.y *= -1;
     }

     // move ship
     transform.position = position;
 }

}

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