Issue with Item List for Shop

Questions & Answers
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1

Been trying to make a list of items that can be unlocked on button click. Basically, clicking on the button shows the item underneath it. At the moment, I only put four items just to test things out. However, for some reason, I am having the following issues:

  1. When I click an item, it’s always item2 that gets unlocked.
  2. When I try clicking the other items, the button does not disappear.
  3. When I exit the shop and return to it, all the items are suddenly unlocked.

This is the code I have for buying an item, and is currently attached to the button itself.

public void UnlockItem()
{
    if(DataManager.Instance.currency >= 20)
    {
        button.gameObject.SetActive(false);
        DataManager.Instance.currency -= 20;
        DataManager.Instance.unlockStatus = true;
        DataManager.Instance.Save();
        Debug.Log("ITEM SHOWN");
    }
    
}

I’ve also tried attaching the script to an empty game object, but it’s still not working as intended. Do the items need a unique ID for this to work? I would appreciate some help on this.

EDIT: Here’s the DataManager code. To clarify, the “item” is really just an image with some text, and is covered by a button. When the button is clicked, the player is able to see the image underneath. That’s it.

public class DataManager : MonoBehaviour
{
    public static DataManager Instance;

    public int score;
    public int currency;
    public bool unlockStatus;

    private void Awake()
    {
        if (Instance != null && Instance != this)
        {
            Destroy(gameObject);
        }
        else
            Instance = this;

        DontDestroyOnLoad(gameObject);
        Load();
                      
    }
     

    [System.Serializable]
    class SaveData
    {
        public int score;
        public int currency;
        public bool unlockStatus;
    }

    public void Save()
    {
        SaveData data = new SaveData();
        data.score = score;
        data.currency = currency;
        data.unlockStatus = unlockStatus;

        string json = JsonUtility.ToJson(data);
        File.WriteAllText(Application.persistentDataPath + "/savefile.json", json);
    }

    public void Load()
    {
        string path = Application.persistentDataPath + "/savefile.json";

        if (File.Exists(path))
        {
            string json = File.ReadAllText(path);
            SaveData data = JsonUtility.FromJson<SaveData>(json);

            score = data.score;
            currency = data.currency;
            unlockStatus = data.unlockStatus;
            
        }
    }
        
}