Toggle Menu Not Working

Dear Coders Can anyone help? I have created a scrolling menu which allows me to add one of two sprites to the transform of an empty gameobject.

On scene loading, the first sprite (Index 0) appears. If I implement buyCharacter, it adds it to my existing empty gameObject. However, I cannot then scroll through to the next character.

However, on scene loading if I toggle right to the second sprite, I can implement buyCharacter and the sprite will be added to my empty game object after which I can then toggle left to the first sprite.

Would anyone have any suggestions as to how I would be able to add either sprite and 'buy' it and still be able to access the other?

Thankyou in advance!

public List chooseSprite;

     public int index;
 
     public GameObject characterSelector;
     public GameObject currentSprite; 
 
     [HideInInspector] public PickPlayer pPlayer; 
     [HideInInspector] public List <GameObject> pPlayerList; 
 
     public void Start ()
     {
      
         List <GameObject> chooseSprite = new List<GameObject> (); 
 
         for (int i = 0; i < chooseSprite.Count; i++) {
             if (chooseSprite [index]) {
                 chooseSprite [index].SetActive (true); 
             }
         }
 
 
     public void  Update (){
 
         currentSprite = chooseSprite [index]; 
 
         if(Input.GetKeyDown(KeyCode.A)){
             buyCharacter(); 
         }
     }
 
     public void ToggleLeft(){
         chooseSprite [index].SetActive (false); 
         index--;
 
         if (index < 0)
             index = chooseSprite.Count - 1;
 
         chooseSprite [index].SetActive (true);
 
     }
 
     public void ToggleRight ()
     {
         chooseSprite [index].SetActive (false); 
         index++;
         if (index == chooseSprite.Count)
             index = 0;
 
         chooseSprite [index].SetActive (true); 
     }
 
     public void buyCharacter (){
 
         for (int i = 0; i < chooseSprite.Count; i++) {
 
             chooseSprite.Remove (currentSprite);
             FindObjectOfType<SkinAdding> ().AddPlayer ();
             index++; 
             if (index == chooseSprite.Count)
                 index = 0;
         }
     }