Collider trigger only affecting a single game object when it should affect multiple

I'm working on a 2D top-down action RPG. I have a fireball spell that instantiates where you click the mouse. It starts small and rapidly expands until it reaches it's maximum size, then destroys itself. I wanted it to both to be a physics collider so that it will push game objects away, and also be a trigger collider to apply damage to them.

My fireball consists of three objects. I have the parent Fireball, which has the fireball script, sprite render, and the animator.

 public class Fireball : MonoBehaviour {
        
        public int damage;
        public float destroyTimer;
 
     void Update () {
     
     if (destroyTimer > 0.5f)
       destroyTimer -= Time.deltaTime;
     if (destroyTimer < 0.5f)
       Destroy(gameObject);
     
     } 
 }

There are two children, one of them only contains the physics collider. The other has the trigger collider and this script.

 public class FireballTrigger : MonoBehaviour {
         
         private int damage;
         public GameObject parent;
         private bool damageDone;
         
     void Start () {
         
         damage = parent.GetComponent<Fireball>().damage;
     }
         
     void OnTriggerEnter2D(Collider2D collider)
     {
         Stats stats = (Stats)collider.gameObject.GetComponent("Stats");
         if (stats != null && damageDone == false)
         {
             stats.AddDamage(-damage);
             damageDone = true;
         }
   }   
 }

Here's where I run into a problem. I set up a scene with a bunch of targets to test it out, but it will only add the damage to one of the targets. I disabled the physics collider to see if it was pushing the objects out of the way of the trigger, but there was no change. How can I get this explosive ball of fire to kill a room full of dudes instead of just one in a crowd?