How does the index trigger work?

How does the controller knows you actually clicked? because I hit my controller on the desk kinda hard by mistake but now the back trigger is always on like you are physically pressing it non stop. I tried connecting only the battery circuit with the second circuit that have the buttons on it and did not connect the thin circuit that connects to the trigger and I was surprised that it’s still doing the same thing.. automatically pressing the index trigger. If you can tell me how it works maybe I can figure out why it’s doing that?