Having that issue myself. Also having the issue that the down button is constantly active, making moving about a little more annoying, especially when trying to fire
Are you playing with a controller or a non-USA keyboard by chance? We don't have any issues with the down button on our end. During the minigame, the crosspad on the left should also tell you when the button is actually being held. Is it constantly highlighted, or is the game pushing you down and not registering the button press? If you could provide a screenshot, that would be super helpful. <3