Clones in Unity not appearing in game view

Hi, I just started learning game development with unity and I just ran into a problem. I created a spawner and the clones don’t appear in game view. It is really strange because the clones appear in the hierarchy and in the scene view. Their Box Colliders work so the character you play gets pushed by the clones, even if they are invisible.

Here is my code for the spawner:

public class MonsterSpawner : MonoBehaviour
{
[SerializeField]
private GameObject[] monsterReference;...

Clones in Unity not appearing in game view