Load and switching level problem

Greetings,

currently i have two levels:

• Level 1 is the main menu,with 3 images called "glock","deagle" and "uzi" inside a Canvas,each one with a child image called "equip_button".

• Level 2 is a map with enemies and has 3 GameObjects also called "glock","deagle" and "uzi",each one with a child object called "flash".

So my objective is when i change from Level 2 to Level 1 the "equip_button" color of the images changes depending of the current weapon:

Script on the Level 1

On Start():

 GameObject[] weapons = GameObject.FindGameObjectsWithTag ("weapon");

In the Update():

 foreach (GameObject child in weapons) {
 if(current_weapon==child.transform.name)
     child.transform.FindChild ("equip_button").GetComponent<Image> ().color = new Color (1, 1, 1, 1);
 }

but instead,i get an error of "Object reference not set to an instance of an object" in the line where i do the FindChild("equip_button").

Debugging and using another foreach i saw that the 3 objects saved on the "weapons" var are the objects of the Level 1!!!(becouse they had the "flash" child instead the "equip_button").So my problem is that the Level 1 script is getting the objects of the Level 2,and that's not possible becouse using the Application.LoadLevel() all GameObjects of the Level 2 should be destroyed...

Take some extra and helpfull info:

• I'm not using the DontDestroyOnLoad method in any object.

• I put on the start() of the Level 1 script a Caching.CleanCache () but didn't work.

• Closing Unity and opening again solves the problem,so i think that this is a memory or cache problem.

• The "glock" "deagle" and "uzi" objects of both levels have the same tag("weapon"),but i'm sure that this is not the problem becouse before getting Unity 5 and using Mecanim all worked perfectly!

Thanks for your attention and sorry for my bad english.