Question Inventory system not working

Very late I'm creating an inventory system and to move items through it I use an OnPointerEnter and then a movetowards.
However, when I try to identify if the mouse is over one of the items, it returns as if it were on top of them all.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.EventSystems;
5.  
6. public class ItemUI : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler
7. {
8.     public bool dragging;
9.     public RPGApplication rpgApplication;
10.     public bool onMouseOver = false;
11.     public int itemIndex;
12.  
13.     private void Start()
14.     {
15.         rpgApplication = GameObject.FindGameObjectWithTag("Management").GetComponent<RPGApplication>();
16.     }
17.  
18.     public void Update()
19.     {
20.         if (Input.GetButtonDown("Fire1") && onMouseOver)
21.             dragging = !dragging;
22.         else if (Input.GetButtonDown("Fire1") && dragging)
23.             dragging = false;
24.  
25.             if (dragging)
26.         {
27.             Vector2 nearTile = Vector2.zero;
28.             foreach (Vector2 vec in rpgApplication.rpgView.playerInventory.inventoryTiles)
29.                 if (Vector2.Distance(new Vector2(Input.mousePosition.x, Input.mousePosition.y), vec) < Vector2.Distance(new Vector2(Input.mousePosition.x, Input.mousePosition.y), nearTile))
30.                     nearTile = vec;
31.             transform.position = Vector2.MoveTowards(transform.position, nearTile, 600 * Time.deltaTime);// new Vector2(Input.mousePosition.x, Input.mousePosition.y);
32.             rpgApplication.rpgView.playerInventory.itemsList[itemIndex].currentTile = nearTile;
33.         }
34.     }
35.     public void OnPointerEnter(PointerEventData eventData)
36.     {
37.         onMouseOver = true;
38.     }
39.  
40.     public void OnPointerExit(PointerEventData eventData)
41.     {
42.         onMouseOver = false;
43.     }
44. }
45.  

 

( this is UGUI related question, it belongs here: https://forum.unity.com/forums/ugui-textmesh-pro.60/ )