1st Problem: OnLevelWasLoaded, method is getting called twice. 2nd: Loading PlayerPrefs

First Problem: As the title states, the method is getting called twice.

I have a scene, which have 2 doors. These doors have a script attached to them which has the OnLevelWasLoaded. When I enter this scene from another scene, the method gets called twice. My guess is that the script is being called from the 2 objects because they have the same script. (I've tested it with debug.log and it shows that the onlevelwasloaded was being called twice)

What I want to do is to make the method to get called only once from the door which I came into.

2nd Problem: I have trouble loading playerprefs. What I want to do is when I first enter the trigger (from scene1) which leads me to scene2, the playerprefs will won't load. And when I enter another trigger from scene2 which leads me to scene 1, I want the playerprefs to load.

In short, I want the playerprefs to won't load the first time i will enter a trigger to another scene, but will load on the future enters.

Here is the script I used, the onlevelwasloaded and playerprefs problem both exist in this script

 using UnityEngine;
 using System.Collections;
 using UnityEngine.SceneManagement;
 
 public class Position : MonoBehaviour {
 
     public Vector3 startPosition;
     public Transform playerPosition;
     public static Position Instance;
     public float PlayerX;
     public float PlayerY;
     public float PlayerZ;
     public float PlayerX2;
     public float PlayerY2;
     public float PlayerZ2;
 
     // Use this for initialization
     void Start () {
 
 
     }
     
     // Update is called once per frame
     void Update () {
 
     }
 
     void OnLevelWasLoaded(){
         Debug.Log(PlayerPrefs.GetInt("Save"));
         PlayerX2 = PlayerPrefs.GetFloat("PlayerX2");
         PlayerY2 = PlayerPrefs.GetFloat("PlayerY2");
         PlayerZ2 = PlayerPrefs.GetFloat("PlayerZ2");
         PlayerX = (PlayerPrefs.GetFloat ("PlayerX"));
         PlayerY = (PlayerPrefs.GetFloat ("PlayerY"));
         PlayerZ = (PlayerPrefs.GetFloat ("PlayerZ"));
 
         if (PlayerPrefs.GetInt("Save") == 1) {
             LoadPos ();
             PlayerPrefs.SetInt ("Save", 0);
             PlayerPrefs.Save ();
         }
         PlayerPrefs.SetInt ("Save", 1);
         PlayerPrefs.Save ();
 
     }
 
     public void  LoadPos(){
             
             startPosition = new Vector3 (PlayerX2, PlayerY2, PlayerZ2);
 
             GameObject.FindWithTag("Player").transform.position = startPosition;
             PlayerPrefs.DeleteAll ();
             PlayerPrefs.Save ();
     }
 
     public void SavePos(){
         PlayerPrefs.SetFloat("PlayerX2", PlayerX);
         PlayerPrefs.SetFloat("PlayerY2", PlayerY);
         PlayerPrefs.SetFloat("PlayerZ2", PlayerZ);
         PlayerPrefs.SetFloat ("PlayerX", PosChar.Instance.PosX);
         PlayerPrefs.SetFloat ("PlayerY", PosChar.Instance.PosY);
         PlayerPrefs.SetFloat ("PlayerZ", PosChar.Instance.PosZ);
         PlayerPrefs.Save ();
         Debug.Log ("SAVED X:" + PlayerPrefs.GetFloat ("PlayerX") + " Y:" + PlayerPrefs.GetFloat ("PlayerY")  + " Z:" + PlayerPrefs.GetFloat ("PlayerZ"));
         Debug.Log ("Values for X2,Y2,Z2 X2:" + PlayerPrefs.GetFloat ("PlayerX2") + " Y2:" + PlayerPrefs.GetFloat ("PlayerY2")  + " Z2:" + PlayerPrefs.GetFloat ("PlayerZ2"));
     }
 
     void OnTriggerEnter(Collider other){
 
         if (other.tag == "Player") {
 
             if (gameObject.name == "FromCityToLiving") {
                 SavePos ();
                 SceneManager.LoadScene ("living room");
                 Debug.Log (gameObject.name);
 
             }
             else if (gameObject.name == "FromLivingToBedroom") {
                 SavePos ();
                 SceneManager.LoadScene ("bedroom");
                 Debug.Log (gameObject.name);
 
             }
             else if (gameObject.name == "FromBedroomToLiving") {
                 SavePos ();
                 SceneManager.LoadScene ("living room");
                 Debug.Log (gameObject.name);
 
             }
             else if (gameObject.name == "FromLivingToCity") {
                 SavePos ();
                 SceneManager.LoadScene ("city");
                 Debug.Log (gameObject.name);
 
             }
         }
 
     }
 }