指数值不根据条件增加

Question

场景中有 15 个可点击的对象。数组中有 5 个标记。用户需要将正确的 5 与该标记相匹配。用户单击其中 5 个（正确的 5 个且顺序正确）。因此，每次调用单击操作时，代码都会增加索引值。该代码使用索引沿着数组移动。但索引值不断变回0。我在这里错过了什么？

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;

public class CipherClickHandler : MonoBehaviour, IPointerClickHandler
{
    public Text[] alanlar = new Text[5];
    private string[] clickedWords = new string[5];
    private string[] solution = { "a", "b", "c", "d", "e" };
    private int index = 0;
    private int counter = 0;
    private bool success = false;

    public void OnPointerClick(PointerEventData pointerEventData)
    {
        if (success)
        {
            return;
        }
        else
        {
            if (index < 5)
            {
                clickedWords[index] = this.gameObject.name;
                this.gameObject.SetActive(false);
                alanlar[index].text = clickedWords[index];
                ControlCipher(clickedWords[index]);
                index += 1;
            }
            else
            {
                index = 0;
            }
        }
    }

    private void ClearBlanks()
    {
        ...
    }

    private void ControlCipher(string token)
    {
        if (counter < 5)
        {
            if (token == solution[index])
            {
                counter++;
            }
        }
        else
        {
            PuzzleSolved();
            success = true;
        }
    }

    private void PuzzleSolved()
    {
        ...
    }

    private IEnumerator CoroutineSuccess()
    {
        ...
    }
}

当我在索引之后跟踪索引时< 5 control, it returns 0. When I trace after index += 1, it returns 1. But, after the next click, it again returns 0 and 1 respectively.