Hello, so I recently modified a gamepad to make my own arcade controller. However I have run into an issue which I do not quite understand. Sometimes the left button will trigger for no apparent reason when the down button is being pressed. First of all, each of my wires to each button have a solder joint which is covered with electrical tape. So I examined it and I found that if my hand was near, or touching the solder joint (covered in electrical tape) of the left button while I was holding down, the left button would fire. What's going on here? And how can I shield it so that it stops? Thanks -Brian.