Why my game just win all the way?

Assume that i have 2 cube as the game object named cube1 and cube2 and 2 transparency cube as collider named co1 and co2 when the cube1 hit the co1 && cube2 hit the co2 = win game

Here's My code of my MainScript

 var Cube1: GameObject;
 var Cube2: GameObject;
 
 function Update()
 {
     Cube1 = GameObject.Find ("Cube_1");
     Cube2 = GameObject.Find ("Cube_2");
 }
 
 function FixedUpdate()
 {
     if (C1.Collided == true && C2.Collided == true)
     {
      Application.LoadLevel("Level_2")
     }
 }

This is the boolean script for co1 and co2, another 1 assigned to co2 just change the cube_1 to cube_2

 static var Collided = false;
 
 function OnTriggerEnter (col : Collider)
 {    
     if(col.name == "Cube_1")
     {
         Collided = true;
         print ("Hit Cube_1");
     }
 }
 
 function OnTriggerExit (col : Collider)
 {
     if (col.name == "Cube_1")
     {
         Collided = false;
         print ("Cube_1 Left");
     }
 }

So now here's the problem, when i play my Level 1, everything goes fine, when i load to level 2 and my cube1 and cube2 haven hit the co1 and co2, it just win the game straight away and load to level 3. But if i direct jump to level 2,everything works fine, This problem happens in other levels as well, can anyone help me?

P/S: Sorry for my broken english

Thank You!