Spawn issues

I have my trigger set to spawn my random prefab from array when entered.
I am trying to get the prefab to spawn 10 units to the right each time the trigger is hit.
Only problem i am getting is, it will work sometimes, other times it will go to a random position.
Here is the code, can anyone tell me what is wrong? Thanks in advance..

Code (CSharp):

1. bool hasSpawned = false;
2.     public GameObject[] myObjects;
3.  
4.  
5.     void OnTriggerEnter(Collider col)
6.     {
7.                 if (col.tag == "Player") {
8.                         if (!hasSpawned) {
9.                                 hasSpawned = true;
10.                                 Spawn ();
11.                         }
12.                 }
13.         }
14.     void Spawn()
15.     {
16.         Instantiate (myObjects [Random.Range (0, myObjects.Length)], transform.position + new Vector3(10,0,0), Quaternion.identity);
17.  
18.  
19.     }
20. }
21.  

 

updated the code a little , but still getting same issue.

Code (CSharp):

1. bool hasSpawned = false;
2.     public GameObject[] myObjects;
3.  
4.  
5.     void OnTriggerEnter(Collider col)
6.     {
7.                 if (col.tag == "Player") {
8.                         if (!hasSpawned) {
9.                                 hasSpawned = true;
10.                                 Spawn ();
11.                         }
12.                 }
13.         }
14.     void Spawn()
15.     {
16.         Instantiate (myObjects [Random.Range (0, myObjects.Length)], new Vector3(0,0,-158.5f), Quaternion.identity);
17.  
18.  
19.     }
20. }
21.  

 

Untested, but see if this works better for you...

Code (CSharp):

1.     bool hasSpawned = false;
2.     public GameObject[] myObjects;
3.     private GameObject myObject;
4.    
5.     void OnTriggerEnter(Collider col)
6.     {
7.         if (col.tag == "Player")
8.         {
9.             if (!hasSpawned)
10.             {
11.                 hasSpawned = true;
12.                 Spawn ();
13.             }
14.         }
15.     }
16.  
17.     void Spawn()
18.     {
19.         myObject = myObjects[Random.Range (0, myObjects.Length)];
20.         Instantiate(myObject, new Vector3(transform.position.x + 10, transform.position.y, transform.position.z), Quaternion.identity);
21.     }