This is more information rather than an on going post.
But several games were not playing right when I was using my FCTWIN controllers instead of SNES controllers.
The FCtwin is a console that plays both NES and SNES games on the same console. The controllers on it are SNES controllers and work properly for NES and SNES games. However, they added the feature that A and Y buttons for a snes controller act as turbo for "A" and "B" buttons for NES games.
Using the controller tester, when A or Y are pressed, it shows them as active, but B and X are in turbo mode at the same time.