spawned clones are visible in scene tab but not visible in game tab

below code is used for spawning enemy character. problem is that the enemy which are spawning are not visible in game view , i can see them in scene view moving but in game view they are invisible , i have tried changing layer of characters , and also tried to align camera view but nothing is working

 void Start()
 {
     StartCoroutine(SpawnMonsters());
 }

 IEnumerator SpawnMonsters()
 {
     while (true)
     {
         yield return new WaitForSeconds(Random.Range(1, 5));
         randomIndex = Random.Range(0, monsterReference.Length);
         randomSide = Random.Range(0, 2);
         spawnedmonster = Instantiate(monsterReference[randomIndex]);
         if (randomSide == 0)
         {
             spawnedmonster.transform.position = leftPos.position;
             spawnedmonster.GetComponent<monster>().speed = Random.Range(4, 10);
         }
         else
         {
             spawnedmonster.transform.position = rightPos.position;
             spawnedmonster.GetComponent<monster>().speed = -Random.Range(4, 10);
             spawnedmonster.transform.localScale = new Vector3(-1f, 1f, 1f);
         }
     }
 }