Erroneous Right/Down constant pressing when used with separate controller.

[Sharkeology]

I am current using the software of this project as a separate VMU to use with my console, it appears and functions perfectly however it will cause the directional pad Right or Down operations to constantly occur after being pressed on a controller connected to a different port. This can be fixed by pressing the button again, but makes any sort of gameplay incredibly difficult.

[psxrester]

you should check your solder points, be careful if you use header pins, this could bend the Arduino and make a wrong connection, use flux for your solder points, don't forget to clean the flux after finishing, some flux can cause a mess if not cleaned properly