Why isn't my instance of an object moving?

Hey, I'm pretty new to unity and am making an infinite runner at the moment. I made it so that the platforms under the character move instead of the actual character.However, when I clone the platform, it doesn't move, even though I have movement set up in it's update function. The first 2 place holder platforms I added in do move, so I am really stumped.

Here is the platform spawner script: public class EnviroHandler : MonoBehaviour {

 public GameObject ground;
 private float groundWidth;
 private float interval;
 private float intervalProgression = 0;
 private ArrayList groundList = new ArrayList();

 // Use this for initialization
 void Start () {
     groundWidth = ground.GetComponent<BoxCollider2D>().size.x;
     interval = ground.GetComponent<groundMovement>().speed;
     
 }
 
 // Update is called once per frame
 void Update () {
     
     if(intervalProgression >= interval){

         groundList.Add(Instantiate(ground, new Vector3(9.2f, -2, 0), Quaternion.identity));

         intervalProgression = 0;

     }else{
         intervalProgression += Time.deltaTime;
     }
 }

}

and here is the script each platform comes with:

public class groundMovement : MonoBehaviour {

 //declaration for certain attributes
 public int speed = 3;
 public float endPos;
 public float width;

 // Use this for initialization
 void Start () {
     
 }
 
 // Update is called once per frame
 void Update () {

     // Move the object to the left, using speed vasriable
     transform.Translate(Vector3.left * Time.deltaTime * speed);


     //destroy object when it moves off screen, based on x position and width
     if (transform.position.x >= endPos + width){
         Debug.Log("destroyed");
         Destroy(this);
     }
 }

}

Any help is greatly appreciated.