Galaga Famicom port and Joystick

[JackLeather]

Can anyone tell me whats going on with the controls on this port (from NES)? 

the joystick appears to work sometimes and then promptly stop.

[JackLeather]

I kept this snippet for some reason;

" came with additional hardware to allow the connection of Nintendo Super Famicom and Sega Megadrive controllers."

could this be a clue? The galaga port i have is from the NES.

[papa_november]

Those ports seem to be static recompilations and can be kind of buggy. I doubt all of them were tested all the way through for playability.