I need fix my character selection problem

I have a characterList gameobject in my hierarchy create, and a selection character script: using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.SceneManagement;

public class CharacterSelection : MonoBehaviour {

 private GameObject[] characterList;
 private int index;


 private void Start()
 {
     index = PlayerPrefs.GetInt("CharacterSelected");

     characterList = new GameObject[transform.childCount];
     for (int i = 0; i < transform.childCount; i++)
     
         characterList[i] = transform.GetChild(i).gameObject;

         foreach (GameObject go in characterList)
             go.SetActive(false);
     

     if (characterList[index])
     {
         characterList[index].SetActive(true);
     }
 }

 public void ToggleLeft()
 {
     characterList[index].SetActive(false);

     index--;
     if (index < 0)
         index = characterList.Length - 1;

     characterList[index].SetActive(true);
 }

 public void ToggleRight()
 {
     characterList[index].SetActive(false);

     index++;
     if (index == characterList.Length)
         index = 0;

     characterList[index].SetActive(true);
 }

 public void SelectButton()
 {
    
     PlayerPrefs.SetInt("CharacterSelected", index);
     SceneManager.LoadScene("Menu");

 }
 

}

When i press select button , everthing goes right, but after i had put a menu scene in build settings before a level1 scene, the menu scene is a scene unlock/selection system, with this nextlevel script;

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.SceneManagement;

public class NextLevel : MonoBehaviour { public int Enemy_To_Unlocked; public GameObject Next_Level; public int max_level; public string num_level; public static int thelevel; public int t; // Use this for initialization void Start () { EnemyManager.Enemy = 0; thelevel = PlayerPrefs.GetInt("thelevel", thelevel); }

 // Update is called once per frame
 void Update () {
     for (int i = 1; i < max_level; i++)
     {
         if (EnemyManager.Enemy == Enemy_To_Unlocked && LevelUnlocked.level == i)
         {
             Next_Level.SetActive(true);
         }
     }
 }
 public static void the_level(int t)
 {
     thelevel = t;
     PlayerPrefs.SetInt("thelevel", thelevel);
 }
 public void next()
 {
     LevelUnlocked.Next_Level();
     SceneManager.LoadScene("Menu");
 }
 public void _level()
 {
     the_level(t);
     SceneManager.LoadScene(num_level);
     
    }

}

Now when i choose my character, a menu scene is load, and when a select a level to play, my player, in the level scene is not who i select in character selecttion, is continues to be the first model in characterList object in Hierachy. Please help me!