Flappy bird sort of game pipes goin crazy

Like you see in this video

The bottom pipes go crazy this is my script for /Pipe Init/BGloop/etc In C#

using UnityEngine; using System.Collections;

public class BGLooper : MonoBehaviour {

 int numBGPanels = 6;

 float pipeMax = 11.53f;
 float pipeMin = 14.2f;

 void Start () {
     GameObject [] pipes = GameObject.FindGameObjectsWithTag("Pipe");

     foreach (GameObject pipe in pipes) {
         Vector3 pos = pipe.transform.position;
         pos.y = Random.Range (pipeMin, pipeMax);
         pipe.transform.position = pos;
     }
 }

 void OnTriggerEnter2D(Collider2D collider) {
     Debug.Log ("Triggered:" + collider.name);

     float widthofBGObject = ((BoxCollider2D)collider).size.x;
     Vector3 pos = collider.transform.position;

     pos.x += widthofBGObject * numBGPanels;

     if (collider.tag == "Pipe") {
         pos.y = Random.Range (pipeMin, pipeMax);
     }
     collider.transform.position = pos;

 }

}