Lethal Enforcers II: Gun Fighters (Genesis/Mega Drive) Random "Off Screen" Shots on Genesis Plus GX

Hi! im experience some random off screen shots (reloads) when im playing with lightgun, also some fps skiping, that bug doesnt happend when playing with joypad. On Lethal Enforcers I works fine and on the CD version. Does anyone experienced this or knows a fix? Thanks!