Android Controller Error

Hi there, I’ve a controller that has an issue with the left analog button. After I press any button, the left analog button mechanically goes down and stays like this, figuring out that each one the buttons work properly, however this button prevents me from enjoying any recreation as a result of the sport, for instance, GTA, will go down. Downward (backward) on a regular basis! What's the answer? Notice that the kind of controller is Mocute-050