You've run into what's known as "Referencing" in programming. An object, by default, is always passed around by reference. This means that no matter how many times you "copy" it or pass it around, it always points to the same location in memory, and it's always the same object (and only one of that object).

To create a copy of an object, you need to do what's known as cloning, though in Unity specifically, it's a bit easier.

With Unity, you can just Instantiate a new object based on the current one, which makes an identical copy of it.

// C#
GameObject myClonedObject = Instantiate(myObject) as GameObject;

// JS
var myClonedObject = Instantiate(myObject);

This creates a copy of the myObject object and places it inside the myClonedObject variable.