OnMouseUp not working in build?

In my game I made a menu with some signs (like Options, Levels, etc), I wrote a script that lets you click on a sign and, for example, load a level using OnMouseUp.

The script is working for all of the signs in the Editor, but for the Build of the game 1 sign is not working, every time I click on it nothing happens. What kind of weird bug is this? A little part of the code:

 using UnityEngine;
 using System.Collections;
 
 public class TextControl : MonoBehaviour {
 
     public int text = 0;
     public AudioClip clickSound;
 
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
 
     }
 
     void OnMouseEnter(){
         renderer.material.color = Color.red;
     }
 
     void OnMouseExit(){
         renderer.material.color = Color.white;
     }
 
     void OnMouseUp(){
         audio.PlayOneShot(clickSound);
         if(text == 0){
             Application.LoadLevel(2);
         }
         .
         . //here are the others (1,2,3,4,5,6,7 etc)
         .
         if(text == 14){                //this is the one that's not working in the Build
             Application.LoadLevel(3);
         }
     }
 }

The Object has a BoxCollider and it turns red when I put the mouse on it, so that's not the problem. In the Editor the Level 3 is loading, but in the Built game nothing happens whenever i click the sign to load that Level.