There could be a series of problems with this issue you're reporting. Since it's a knock off controller it could be:
* Damage to the PCB during manufacturing.
* A bad button indicator.
* Some kind of liquid making a crossed connection.
Get a tri-wing driver, open up the device and inspect it. Clean up the area with rubbing alcohol, inspect the button and the pad it rests on and look over the cuircit board to see if there are broken traces or other signs of damage. If you're having any issues determining the problem. Take a few pictures and add them to this post to see if there is anything you may have overlooked.
Hopefully, we can get this controller working properly again. Good luck!