My checker work 2 times

So, i writing a code where is enemy taking damage when special object is active

 void DmgCheck()
     {
         if (Yellow.gameObject.activeSelf)
         {
             hp[enemyID] -= dmgHero;
         }
 
         else if (Red.gameObject.activeSelf)
         {
             hp[enemyID] -= dmgHero;
         }
 
         else if (Green.gameObject.activeSelf)
         {
             hp[enemyID] -= dmgHero;
         }
     }

This is code for my enemy

 public void OnTriggerStay2D(Collider2D pointer)
     {
         if (attack == false)
         {
             greenAttack.SetActive(false);
             yellowAttack.SetActive(false);
             redAttack.SetActive(false);
         }
         if (pointer.gameObject.CompareTag("Green") && (attack == true))
         {
             greenAttack.SetActive(true);
             attack = false;
             hero.transform.position = new Vector3(-7,3,-1);
             Debug.Log("green");
         }
         else if (pointer.gameObject.CompareTag("Yellow") && (attack == true))
         {
             yellowAttack.SetActive(true);
             attack = false;
             hero.transform.position = new Vector3(-7, 3, -1);
             Debug.Log("yellow");
         }
         else if (pointer.gameObject.CompareTag("Red") && (attack == true))
         {
             redAttack.SetActive(true);
             attack = false;
             hero.transform.position = new Vector3(-7, 3, -1);
             Debug.Log("red");
         }
     }

And this is my code for activator

So, in game enemy taking hit two times and i dont know why.