Why is the Winning text appearing after starting the game?

In my animation, after destroying all objects, appears texts: WinningImage, ExitButton, NextLevelButton appear.

I do not understand why: WinningImage, ExitButton, NextLevelButton;, appear immediately after pressing PLAY, while it should be turned off until the animation is won.

Could someone find a mistake?

  using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.SceneManagement;
 
 public class Gamer : MonoBehaviour {
     
     [SerializeField]
     Camera camMain; // drag n drop in the inspector
 
     int index =1;
     public GameObject ImageOver, restartButton , menuButton;
 
     public GameObject WinningImage, ExitButton, NextLevelButton ;
 
     public GameObject Manager;
 
 
 
 
     public void OnCollisionEnter2D (Collision2D col)
     {
         Debug.Log("Player hit object: " + col.transform.name);
         //check if the object you hit is one of the "collisionObjects":
         collisionObject colObj= col.transform.GetComponent<collisionObject>();
         if(!colObj) return;
         CheckDestroyedIndex(colObj);
 
 
     }
     void CheckDestroyedIndex(collisionObject cObj) {
         if(index == cObj.myIndexNumber)
         {
             if (cObj.isHighestNumber)
             {
                 Debug.Log ("Yay you correctly hit the last Square, You WIN!");
                 WinningImage.SetActive (true);
                 restartButton.SetActive (true);
                 gameObject.SetActive (false);
                 Manager.SetActive (false);
 
             }
             Destroy(cObj.gameObject);
             index++;
         }
         // here, we know it didn't match the number. :)
         else
         {
             ImageOver.SetActive (true);
             restartButton.SetActive (true);
             menuButton.SetActive (true);
             gameObject.SetActive (false);
             Manager.SetActive (false);
             WinningImage.SetActive (false);
         }
     }
     void Update() {
         if(Input.GetMouseButtonDown(0)) {
             RaycastHit2D hit = Physics2D.Raycast(camMain.ScreenToWorldPoint(Input.mousePosition), Vector3.zero);
             if(hit) {
                 collisionObject cObj = hit.collider.GetComponent<collisionObject>();
                 if(cObj) CheckDestroyedIndex(cObj);
             }
         }
     }
 
 }