Thats odd. I never had Mega Everdrive Pro but I tested it on Mega Drive 2 via Mega Everdrive and on Master System via Master Everdrive and it always works. Maybe there is something with Mega Everdrive Pro firmware for some games?
I've got it working now. The ROM didn't like the SMS bios I was using. I'm enjoying the game 👍
Thats great and thanks for update!