Prefab connection is not breaking?

I've made 2 different key type objects in my game, each of them with a different function #1 activates a basic bridge which is just a cube with 2d colliders in a variable #2 deactivates a cube to open doors. I made them both separately with different scripts but when I tried to set the texture of the bridgeKey (this was without making a prefab) is automatically changed the texture of the doorKey's prefab and thus it in all of my levels. This makes no sense because they aren't connected. Can someone explain? I will put script below but I don't think that they have any problems. enter code here #pragma strict

 var sphere : GameObject;
 var keyItem : GameObject;
 
 function OnTriggerExit2D(other : Collider2D) {
 keyOpen();
 }
 
 function keyOpen() {
 sphere.active = true;
 keyItem.active = false;
 }
 
 
 //the code for the door next
 
 #pragma strict
 
 var sphere : GameObject;
 
 function OnTriggerExit2D(other : Collider2D) {
 keyOpen();
 }
 
 function keyOpen() {
 sphere.active = false;
 
 }