Endless Runner with List

Hi! I have written a code to generate endless platforms (always the same) and works perfectly.

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class PlatformGenerator : MonoBehaviour {
     //Check position character player and regenerates platforms
     public GameObject playerRef;
     //Unit distance to start recycle prefabs
     public float DistanceToRecycle = 25;
 
     //Set up maximum number of platform to draw
     public int NumberOfPlatforms = 5;
 
     //Set up start point and next position
     public Vector3 startPosition;
     private Vector3 nextPosition;
 
     //Gameobject empty startpoint to generate platform
     public Transform prefab;
 
     public List<GameObject> platforms = new List<GameObject>();
 
     //Settings dimension, distance and  position platforms
     public Vector3 minScale = new Vector3();
     public Vector3 maxScale = new Vector3();
     public float minGap;
     public float maxGap;
     public Vector3 minHeight = new Vector3(); 
     public Vector3 maxHeight = new Vector3();
 
     // Use this for initialization
     void Start () {
         //Find target 
         playerRef = GameObject.FindGameObjectWithTag("Player");
 
         nextPosition = startPosition;
 
         for (int i = 0; i < NumberOfPlatforms; i++) {
             Transform startPoint = (Transform)Instantiate(prefab);
             startPoint.localPosition = nextPosition;
             nextPosition.x += startPoint.localScale.x;
         }
         //Loading platforms prefab and draws maximum number of platforms from folder"Resources/Prefabs/Platforms/Platform1"
         GameObject platformPrefab = Resources.Load ("Prefabs/Platforms/Platform1") as GameObject;
         for (int i=0; i<NumberOfPlatforms; i++){
             GameObject floor = Instantiate (platformPrefab,Vector3.zero,Quaternion.identity) as GameObject;
 
             //Generate a random scale dimension of platform prefab
             Vector3 tempScale = new Vector3(Random.Range (minScale.x,maxScale.x),1,1);
             floor.transform.localScale = tempScale;
 
             //Generate platform prefab adjacent sequence
             Vector3 tmpPos = new Vector3();
             if(platforms.Count>0) {
                 tmpPos = platforms[platforms.Count-1].transform.position;
                 tmpPos.x += platforms[platforms.Count-1].transform.localScale.x *.5f;
                 tmpPos.y = Random.Range(minHeight.y, maxHeight.y);
                 tmpPos.x += floor.transform.localScale.x *.5f;
             }
             tmpPos.x += Random.Range(minGap, maxGap);
             floor.transform.position = tmpPos;
             floor.transform.parent = gameObject.transform;
             platforms.Add(floor);
         }
     }
     
     // Update is called once per frame
     void Update() {
         //Check distance between player and last platform and remove old for generate new platforms
         if(platforms[0].transform.position.x + DistanceToRecycle < playerRef.transform.position.x){
             GameObject floor = platforms[0];
             platforms.Remove (floor);
         
             //Generate a random scale dimension of platform prefab
             Vector3 tmpScale = new Vector3(Random.Range (minScale.x,maxScale.x),1,1);
             floor.transform.localScale = tmpScale;
 
             //Generate platform prefab adjacent sequence
             Vector3 tmpPos = new Vector3();
             if(platforms.Count>0) {
                 tmpPos = platforms[platforms.Count-1].transform.position;
                 tmpPos.x += platforms[platforms.Count-1].transform.localScale.x *.5f;
                 tmpPos.y = Random.Range(minHeight.y, maxHeight.y);
                 tmpPos.x += floor.transform.localScale.x *.5f;
             }
             //Generate random distance between platforms
             tmpPos.x += Random.Range(minGap, maxGap);
             floor.transform.position = tmpPos;
             floor.transform.parent = gameObject.transform;
             platforms.Add (floor);
         }
     }
 }

I started with this code base to create one that would generate different platforms from a prefabs list with the command LIST. BUT I have the problem that the prefabs are generated as distant as you see in the image.

Now the revised script to generate X prefabs from a predefined list of different prefabs. using UnityEngine; using System.Collections; using System.Collections.Generic;

 public class PlatformGenerator : MonoBehaviour {
     
     //Check position character player and regenerates platforms
     public GameObject playerRef;
     
     //Gameobject empty to create start point to generate platform
     public Transform prefab;
     
     //Set up maximum number of platform to draw
     public int numberOfPlatforms;
     
     //Set parameter units distance to regenerate platforms
     public float DistanceToRecycle;
     
     //Set up start point and next position
     public Vector3 startPosition;
     private Vector3 nextPosition;
 
     //My Prefabs List's
     public List<GameObject> platforms;
     
     public float minGap, maxGap;
     public Vector3 minHeight = new Vector3(); 
     public Vector3 maxHeight = new Vector3();
     
     // Use this for initialization
     void Start () {
         //Find target 
         playerRef = GameObject.FindGameObjectWithTag("Player");
 
         nextPosition = startPosition;
 
         for (int i = 0; i < numberOfPlatforms; i++) {
             Transform startPoint = (Transform)Instantiate(prefab);
             startPoint.localPosition = nextPosition;
             nextPosition.x += startPoint.localScale.x;
         }
 
         //Loading platforms prefab and draws maximum number of platforms from "prefab list"
         for (int i=0; i<numberOfPlatforms; i++){
             GameObject floor = Instantiate(platforms[Random.Range(0,platforms.Count)],Vector3.zero,Quaternion.identity) as GameObject;
             
             //Generate prefabs platforms at different heights
             Vector3 tmpPos = new Vector3();
         
             if(platforms.Count>0) {
                 tmpPos = platforms[platforms.Count-1].transform.position;
                 tmpPos.x += platforms[platforms.Count-1].transform.localScale.x *.5f;
                 tmpPos.y = Random.Range(minHeight.y, maxHeight.y);
                 tmpPos.x += floor.transform.localScale.x *.5f;
             }
             //Generate random distance between platforms
             tmpPos.x += Random.Range(minGap, maxGap);
             floor.transform.position = tmpPos;
             floor.transform.parent = gameObject.transform;
             platforms.Add(floor);
         }
     }
     // Update is called once per frame
     void Update() {
         //Check distance between player and last platform and remove old for generate new platforms
         if(platforms[0].transform.position.x + DistanceToRecycle < playerRef.transform.position.x){
             GameObject floor = platforms[0];
             platforms.Remove (floor);
 
             //Generate prefabs platforms at different heights
             Vector3 tmpPos = new Vector3();
             if(platforms.Count>0) {
                 tmpPos = platforms[platforms.Count-1].transform.position;
                 tmpPos.x += platforms[platforms.Count-1].transform.localScale.x *.5f;
                 tmpPos.y = Random.Range(minHeight.y, maxHeight.y);
                 tmpPos.x += floor.transform.localScale.x *.5f;
             }
             //Generate random distance between platforms
             tmpPos.x += Random.Range(minGap, maxGap);
             floor.transform.position = tmpPos;
             floor.transform.parent = gameObject.transform;
             platforms.Add (floor);
         }
     }
 }

Why with the script that generates the same prefab these are generated just below the player while the script that generates several cabins taken from a list, creates platforms away from the character? Thank you for your help!