Prefabs dont instantiate directly on point

So I am trying to get all these prefabs to spawn on a certain point. Some spawn perfectly, while others spawn off point on the Z axis

     public GameObject[] prefab;
     public Transform spawnrotation;
     public float speed;
     public int raysize;
 
     private Rigidbody rb;
 
 
     void Start ()
     {
     StartCoroutine(StartLoader());
     }
    
     IEnumerator StartLoader ()
     {
     //void Update()
     {
                     transform.rotation = Quaternion.identity;
                     int prefab_num = Random.Range (0, raysize);
                     Instantiate (prefab [prefab_num], spawnrotation.position, spawnrotation.rotation);
                     yield return new WaitForSeconds(speed);
             }
                     {
 
                     StartCoroutine(StartLoader());
 
                     }
 
 
                         }

}