Script's if statement dealing with time/float modulus remainder zero does not work properly when done with Application.LoadLevel() from other scene?

Hi, I have a problem dealing with time in this line of code:

 Time.timeSinceLevelLoad % levelUpBySeconds == 0f;

It works perfectly if I'm in the scene with that script in empty gameObject called "GameManager" in "Level_Start" scene as my starting scene, but when it came from other scene ("Start_Scene") and load it or load it again ( Application.LoadLevel("Level_Start") / using UnityEngine.SceneManagement; SceneManager.LoadScene("Level_Start") ) – it does not work anymore. Why is this happening?

Is Time.time or Time.timeSinceLevelLoad loses its precision in calculations when Application.LoadLevel() is done? or is the problem with modulus ( % )?

My "Level_Start" scene:

You see, when I play this scene with my editor, this works properly; let's say, I set my public preference "levelUpBySeconds" to 10, it means every 10 secs will update my "LevelValue" in hierarchy added by 1, and also instantiate 1 "EnemySpawn" prefab every level rises by 1: (working properly)

My "Start_Scene" scene: if I start here or go here...

...and go to "Level_Start" scene (again) by Application.LoadLevel(); now the "LevelValue" stays at 1 forever: (not working)

Please just look for this line below:

if (Time.timeSinceLevelLoad % levelUpBySeconds == 0f && Time.timeSinceLevelLoad > 0f) in line 38 (and also 54 which have no problem unlike line 38) of GameController.cs.

Note: I have tried Time.time - timeElapse % levelUpBySeconds == 0f where timeElapse is a variable initiate from start with Time.time, or Mathf.Repeat(Time.timeSinceLevelLoad, levelUpBySeconds) == 0 still the same result...

GameController.cs

 using UnityEngine;
 using UnityEngine.UI;
 using System.Collections;
 
 public class GameController : MonoBehaviour {
 
     public float levelUpBySeconds = 60f;
     public int levelUpByScore = 0;
     [Range(1,100)] public int level = 1;
     public Transform parentInstantiatorPrefab;
     public Transform enemySpawnPrefab;
 
     void Start () {
         if (level > 0)
         {
             SetLevel();
             for (int i = 1; i < level; i++ )
             {
                 SetEnemySpawn();
             }
         }
         /*else    //uses "[Range(1,100)]" instead... works like a charm! ;)
         {
             level = 1;
             SetLevel();
         }*/
     }
     
     void FixedUpdate () {
         SetLevelByTime();
         if (Input.GetKeyUp(KeyCode.Escape)) {
             Application.LoadLevel("Start_Scene");
         }
     }
 
     void SetLevelByTime()
     {
         GameObject.Find("TimeValue").GetComponent<Text>().text = System.Math.Round(Time.timeSinceLevelLoad, 2).ToString();
         if (levelUpBySeconds > 0f)
         {
             if (Time.timeSinceLevelLoad % levelUpBySeconds == 0f && Time.timeSinceLevelLoad > 0f)
             {  /*### ^up PLEASE SEE this if statement what's going on here? ###*/
                 level++;
                 SetLevel();
             }
            if (Time.timeSinceLevelLoad == 10) //Edited: I just add this line of code to see...
                Debug.Log(Time.timeSinceLevelLoad.ToString()); //As mention, does not work/display when loaded from other Scene as start scene!
            if (Time.timeSinceLevelLoad == 20) //Edited: I just add this line of code to see...
                Debug.Log(Time.timeSinceLevelLoad.ToString()); //As mention, does not work/display when loaded from other Scene as start scene!
         }
     }
 
     public void SetLevelByScore(int currentScore)
     {
         if (levelUpByScore > 0f)
         {
             if (currentScore % levelUpByScore == 0 && Time.timeSinceLevelLoad > 0f)
             { /*### ^up PLEASE SEE ALSO this if statement, it works perfectly as we expected! ###*/
                 level++;
                 SetLevel();
             }
         }
     }
 
     void SetLevel ()
     {
         GameObject.Find("LevelValue").GetComponent<Text>().text = level.ToString();
         SetEnemySpawn();
     }
 
     void SetEnemySpawn()
     {
         Instantiate(enemySpawnPrefab, parentInstantiatorPrefab);
     }
 }

ScoreController.cs (Extra, just look, no problem here)

 using UnityEngine;
 using UnityEngine.UI;
 using System.Collections;
 
 public class ScoreController : MonoBehaviour {
 
     private int currentScore = 0;
     private int highScore = 0;
 
     void Start ()
     {
         if (PlayerPrefs.HasKey("highScore"))
         {
             highScore = PlayerPrefs.GetInt("highScore");
         }
         else
         {
             PlayerPrefs.SetInt("highScore", 0);
         }
         GameObject.Find("HighScoreValue").GetComponent<Text>().text = highScore.ToString();
         SetScore();
     }
     
     public void AddScore ()
     {
         currentScore++;
         if (currentScore > highScore)
         {
             PlayerPrefs.SetInt("highScore", currentScore);
         }
         SetScore();
     }
 
     void SetScore()
     {
         GameObject.Find("ScoreValue").GetComponent<Text>().text = currentScore.ToString();
         GameObject.Find("GameManager").GetComponent<GameController>().SetLevelByScore(currentScore);
     }
 }

StartSceneController.cs (Extra, just look, no problem here)

 using UnityEngine;
 using System.Collections;
 
 public class StartSceneController : MonoBehaviour {
 
     void Update () {
         if (Input.GetKeyUp(KeyCode.Return) || Input.GetKeyUp(KeyCode.Mouse0)) {
             Application.LoadLevel("Level_Start");
         }
         if (Input.GetKeyUp(KeyCode.Escape)) {
             Application.Quit();
         }
     }
 }