Mayflash Univ. Fight Stick Help!

Ok, I remember reading on Mayflash’s Website about the Universal Fight Stick, and how they said dont put the ps2 controller port and usb port in the ps2 at the same time, and now im wondering why cant I do that? Because I’ve been having problem installing my fight stick on my computer. Leave anything that might be helpful. I appreciate it.

It can send too much voltage and burn out your PCB

FattyWinnarz is there a way to fix it?