Problem with variables

I have two types of boats in my 2D game. I'm cloning boats and sending to another side of screen. First type works fine, but second no. When i use breakpoints to find problem, i clone first boat of sekond type fine, but second was cloned to same x coordinates. I check array with childs transforms and everythink was null.

First type script:

 using UnityEngine;
 using System.Collections;
 
 public class lod_normal_vpravo : MonoBehaviour
 {
 
         public static bool spawnship;
         static Transform[] childs;
         
         // Use this for initialization
         void Start ()
         {
             childs = new Transform[40];
         }
     
         // Update is called once per frame
         void Update ()
         {
                 if (spawnship) {
                         SpawnChild ();
                 }
 
                 for (int i = 0; i<childs.Length; i++) {
                         if (childs [i] != null) {
                                 childs [i].Translate (Vector3.left * Time.deltaTime, Camera.main.transform);
                                 if (childs [i].position.x < 0 - childs [i].renderer.bounds.size.x) {
                                         Destroy (childs [i].gameObject);
                                         childs [i] = null;
                                 }
                         }
                 }
                 //transform.Translate (Vector3.left * Time.deltaTime, Camera.main.transform);
         }
 
         void SpawnChild ()
         {
                 bool volno = true;
                 int i = 0;
                 while (volno) {
                         if (childs [i] == null) {
                                 volno = false;
                         } else {
                                 if (i == 39) {
                                         return;
                                 }
                                 i++;
                         }
                 }
 
                 childs [i] = Instantiate (transform) as Transform;
                 float position = Random.Range (6.5f, 9.8f);
                 childs [i].localPosition = new Vector3(childs [i].position.x, position, childs [i].position.z);
                 spawnship = false;
         }
 }
 

Second type script:

 using UnityEngine;
 using System.Collections;
 
 public class lod_normal_vlevo : MonoBehaviour {
 
     public static bool spawnship;
     Transform[] childs;
 
     // Use this for initialization
     void Start () {
         childs = new Transform[40];
     }
     
     // Update is called once per frame
     void Update () {
         if (spawnship) {
             SpawnChild ();
         }
         
         for (int i = 0; i<childs.Length; i++) {
             if (childs [i] != null) {
                 childs [i].Translate (Vector3.right * Time.deltaTime, Camera.main.transform);
                 if (childs [i].position.x > Screen.width) {
                     Destroy (childs [i].gameObject);
                     childs [i] = null;
                 }
             }
         }
     }
 
     void SpawnChild ()
     {
         bool volno = true;
         int i = 0;
         while (volno) {
             if (childs [i] == null) {
                 volno = false;
             } else {
                 if (i == 39) {
                     return;
                 }
                 i++;
             }
         }
         
         childs [i] = Instantiate (transform) as Transform;
         float position = Random.Range (6.5f, 9.8f);
         childs [i].localPosition = new Vector3(childs [i].position.x, position, childs [i].position.z);
         spawnship = false;
     }
 }