Bool is still false on another script even if it's its true onTriggerEnter2d

Hello guys, I check If something triggers on my platform. If so, i am making it true. But when i reach that on another script, it shows as false even if i trigger the collide (and in the trigger script, in turns true). Platform script works fine, i referenced it. My code basically needs to do: if its true, i will let it drop to area.

 >  private void Awake()
     >     {
     >         Instance = this;
     >     }
     > 
     >     public bool IsInsidePlatform { get; set; }
     >     
     >     
     >     private void OnTriggerEnter2D(Collider2D other)
     >     {
     >         IsInsidePlatform = true;
     >     }
     > 
     >     private void OnTriggerExit2D(Collider2D other)
     >     {
     >         IsInsidePlatform = false;
     >         Debug.Log("Leaving" + other.gameObject.name);
     >     }
     
     
 
     */// Another Script
             if (Input.GetMouseButtonUp(0) && platform.IsInsidePlatform)
             {
                Debug.Log(platform.IsInsidePlatform); // returns false.need to return true.
                 _selected = false;
             }

On Platform script, as you see its true. And on my another script in Update, if its true. it needs to place. But its not doing it. if i dont add platform.isInsiedPlatform, it works fine.