NEED HELP script doesn't work after reloading project

Hi
I have the this object pooling script in my game that works just fine. But every time I reload my project I have to remove the script from the respective game object just to readd it and set all the parameters again. Does anyone know what the problem could be?

The script:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class ObjectPooler : MonoBehaviour
{
    [System.Serializable]
    public class Pool
    {
        public string tag;
        public GameObject prefab;
        public int size;
    }

    #region Singleton
    public static ObjectPooler Instance;

    private void Awake()
    {

        Instance = this;

    }
    #endregion
    public Dictionary<string, Queue<GameObject>> poolDictionary = new Dictionary<string, Queue<GameObject>>();

    public List<Pool> pools;
    // Start is called before the first frame update


    void Start()
    {

        foreach (Pool pool in pools)
        {
            Queue<GameObject> objectPool = new Queue<GameObject>();

            for (int i = 0; i < pool.size; i++)
            {
                GameObject obj = Instantiate(pool.prefab);
                obj.SetActive(false);
                objectPool.Enqueue(obj);
            }

            poolDictionary.Add(pool.tag, objectPool);
        }
    }

    public GameObject SpawnFromPool(string tag, Vector3 position, Quaternion rotation)
    {
        if (poolDictionary.ContainsKey(tag))
        {


            GameObject objectToSpawn = poolDictionary[tag].Dequeue();

            objectToSpawn.transform.position = position;
            objectToSpawn.transform.rotation = rotation;
            objectToSpawn.SetActive(true);
            poolDictionary[tag].Enqueue(objectToSpawn);
            return objectToSpawn;
        }
        else
        {
            Debug.Log("Pool with tag " + tag + " doesn't exist.");
            return null;
        }

    }
}

I figured it out, I just had to put the script before default time in the Script Execution Order.