Spawn Hazard, clone behave diffrent

Hey guys!

I'm trying to build a game where u need to dodge falling objects. I've made a hazard but it seems as if the hazard 'clone' is behaving diffrently.

I've made a collision script when the hazard hits the platform it needs to disappear. This works for the hazard block, but not the hazard clone blocks that fall.

• As u can see in the first screenshot, the red circled block behaves like it use to. But the blue circled once (clones) fall right through objects.

• As u can see in the second screenshot, the red circled one is gone, because it hit the platform. But still the blue once fall right through.

Below is the Collision script i've made. Below that is the Spawn Hazard script.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class HazardCollisionFunctions : MonoBehaviour {
 
     #region Variables
     //Public
 
     //Private
     #endregion
 
     #region UnityFunctions
     void Start()
     {
         
     }
     void Update()
     {
         
     }
     #endregion
 
     private void OnCollisionEnter(Collision collision)
     {
         if(collision.gameObject.tag == "platform")
         {
             this.gameObject.SetActive(false);
         }
 
         if(collision.gameObject.tag == "Player")
         {
 
         }
     }
 }

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class SpawnHazards : MonoBehaviour {
 
     #region Variables
     //Public
 
     //Private
     [SerializeField]
     public float minX = 0.0f;
     [SerializeField]
     public float maxX = 0.0f;
     [SerializeField]
     private GameObject[] hazards;        //potential array of hazards
     [SerializeField]
     private float timeBetweenSpawns = 0.0f;
     private bool canSpawn = false;
     private int amountOfHazardsToSpawn = 0;
     private int hazardToSpawn = 0;
     #endregion
 
     #region UnityFunctions
     public void Start()
     {
         canSpawn = true;    //Temp start
     }
     public void Update()
     {
         if(canSpawn == true)
         {
             StartCoroutine("GenerateHazard");
         }
     }
     #endregion
 
     private IEnumerator GenerateHazard()
     {
         canSpawn = false;
         timeBetweenSpawns = Random.Range(0.5f, 2.0f);       //Testing values
         amountOfHazardsToSpawn = Random.Range(1, 5);        //Testing values
         for(int i = 0; i < amountOfHazardsToSpawn; i ++)
         {
             Vector3 spawnPos = new Vector3(Random.Range(minX, maxX), 8.0f, 0.0f);   //Gen spawnpoint for the hazard
             Instantiate(hazards[hazardToSpawn], spawnPos, Quaternion.identity);     //Spawn the hazard
         }
         yield return new WaitForSeconds(timeBetweenSpawns);
         canSpawn = true;
     }
 }
 

THANKS IN ADVANCE GUYS!