Instantiated clones are spawning much bigger than original

So long story short, my spawn manager is somehow creating clones that are much bigger than the original object and do not function at all. It's as if they're being instantiated without the script? I have no idea what's going on or how to fix it.

Here's the code for the spawn manager:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class SpawnManager : MonoBehaviour
6. {
7.     [SerializeField]
8.     private GameObject enemyPrefab;
9.  
10.     [SerializeField]
11.     private GameObject[] powerups;
12.  
13.     void Start()
14.     {
15.         StartCoroutine(EnemySpawnRoutine());
16.     }
17.     IEnumerator EnemySpawnRoutine()
18.     {
19.         while (true)
20.         {
21.             Instantiate(enemyPrefab, new Vector3(Random.Range(-7f, 7f), 7, 0), Quaternion.identity);
22.             yield return new WaitForSeconds(5.0f);
23.         }
24.     }
25. }
26.  

Here is a demonstration

 

Looking at your log you are missing some scripts, such as "Enemy" and another unknown one. Did you look into if any of those scripts are responsible for scaling? If they're really not being used, just remove their references from the prefabs to reduce your warning chuff.