my prefab clone object are falling from ground in y direction?

I deleted my game objects and created there prefabs and instantiate each prefab of clone, but in game my clone game object falls in y direction( in the screenshot my prefab object pins and ball both are not in there initial position and falling from the lane. How can i solve this problem? Here is my code....

public class GameManager : MonoBehaviour {

 public GameObject ballprefab;
 public GameObject[] pinprefab;
 public GameObject cameraprefab;
 public GameObject maincameraprefab;
 void SwanAll()
 {
     for(int i = 0; i<10; i++)
     {
         Instantiate(pinprefab[i], pinprefab[i].transform.position, pinprefab[i].transform.rotation);
     }
     Instantiate(ballprefab, ballprefab.transform.position, ballprefab.transform.rotation);
     Instantiate(cameraprefab, cameraprefab.transform.position, cameraprefab.transform.rotation);
     Instantiate(maincameraprefab, maincameraprefab.transform.position, maincameraprefab.transform.rotation);
 }
 private void Awake()
 {
     SwanAll(); 
 }

}

[1]: /storage/temp/123886-unity-question.jpg