Question Drag And Drop problem

Hi,

I use Unity 2019.3.13f1 and I have a little problem with Drag And Drop script.

I hope to be clear and to write well.

I'm doing a little card game where you choose the card and place it in a table. But the card, that are a drag item, is positioned when i move the card and doing a miss click and click drop space.
Otherwise return at start position.

The Card are a Button Component and runtimes are inserted as children into the Content of a Scrollrect, this Scrollrect has a Grid Layout Component.

And Slot are a Image Component that have Grid Layout Component, children of Board that have Canvas Group Component

Share my script:

Drag Item:

Code (CSharp):

1.  
2. using UnityEngine;
3. using UnityEngine.EventSystems;
4.  
5. public class CardBehaviour : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
6. {
7.     Vector3 startPosition;
8.     int orderCard;
9.     Transform startTransform;
10.  
11.     public static GameObject actualCard = default;
12.  
13.     void Start()
14.     {
15.         startTransform = GameObject.Find("Content").transform;
16.     }
17.  
18.     public void OnBeginDrag(PointerEventData eventData)
19.     {
20.         actualCard = this.transform.gameObject;
21.         startPosition = this.transform.position;
22.         orderCard = this.transform.GetSiblingIndex();
23.         this.transform.SetParent(GameObject.Find("Canvas").transform);
24.         Board.Instance.transform.GetComponent<CanvasGroup>().blocksRaycasts = false;
25.     }
26.  
27.     public void OnDrag(PointerEventData eventData)
28.     {
29.         this.transform.position = eventData.position;
30.     }
31.  
32.     public void OnEndDrag(PointerEventData eventData)
33.     {
34.         Board.Instance.transform.GetComponent<CanvasGroup>().blocksRaycasts = true;
35.         if(transform.parent != startTransform.parent)
36.         {
37.             this.transform.SetParent(startTransform.transform);
38.             this.transform.SetSiblingIndex(orderCard);
39.             this.transform.position = startPosition;
40.         }
41.     }

Drop Slot:

Code (CSharp):

1.  
2. public void OnDrop(PointerEventData eventData)
3.     {
4.         if (this.transform.childCount == 0)
5.             CardBehaviour.actualCard.transform.SetParent(this.transform);
6.         CardBehaviour.actualCard = null;
7.     }