Level Selection menu problem camera boundary

My level selection menu scene will be a graphic map. Think level selection similar to candy crush. I have different sprites for different maps that will be instantiated when the user moves the camera to that map. In order for me to achieve this, I scroll/move the camera using touch on it's Y-axis. But the problem is, I'm having a trouble getting the boundary of the map sprite, I already read a lot of solution about this one. Here is my current script. I don't know what I'm doing wrong. My camera got stuck when it is near the boundary. Thank you for your help

 public float scrollSpeed = 10.0f;
         public GameObject[] maps;
         
         Camera mainCamera;
     
         private float topBound;
         private float bottomBound;
         private Vector3 pos;
         private SpriteRenderer currentSprite;
         private int mapIndex;
         void Awake () 
         {
             mapIndex = 0;
             mainCamera = Camera.main;
             currentSprite = maps [mapIndex].GetComponent<SpriteRenderer> ();
             bottomBound = currentSprite.sprite.bounds.size.y * -1;
             topBound = currentSprite.sprite.bounds.size.y + currentSprite.gameObject.transform.position.y;
         }
     
         void Update () 
         {
             if (Input.touchCount > 0 && Input.GetTouch (0).phase == TouchPhase.Moved)
             {
                 Vector2 touchDeltaPosition = Input.GetTouch(0).deltaPosition;
     
                 mainCamera.transform.Translate(0f,-touchDeltaPosition.y * scrollSpeed * Time.deltaTime,0f);
     
             }
     
         }
     
         private float getAxisDelta(float axisDelta,float camMin,float camMax,float bottom,float top)
         {
             //get where edge of camera will have moved if full translate is done
             float boundaryMinPixelsDestination = camMin - Mathf.Abs(axisDelta);
             float boundaryMaxPixelsDestination = camMax + Mathf.Abs(axisDelta);
     
             Debug.Log("MaxPixels:"+boundaryMaxPixelsDestination+"="+camMax+"+"+Mathf.Abs(axisDelta));
             //check to see if you're within the border
             if ((boundaryMinPixelsDestination <= bottom && axisDelta > 0) ||
                 (boundaryMaxPixelsDestination >= top && axisDelta < 0))
             {
                 axisDelta = 0;
             }
     
             return axisDelta;
     
         }
     
         private float camBoundPos(string pos)
         {
             float bounds = 0f;
             if (pos == "top")
                 bounds = mainCamera.transform.position.y + mainCamera.orthographicSize;
             if(pos == "bottom")
                 bounds = mainCamera.transform.position.y - mainCamera.orthographicSize;
     
             return bounds;
         }