World of Kung Fu - Double Keystroke Problem

Hi, I'm playing a game called World of Kung Fu. The official server shut down and I'm playing on a private server. I am having an issue where everything I press is doubled. I have to copy and paste to enter my login information. Please help.

http://www.mayhem-kungfu.com

[Kaische]

http://isboxer.com/wiki/FAQ#Will_this_work_on_a_private_server.3F