Gamecube Controller on keyboard: "A" and "Start" button do the same thing?

[OneRussian]

Hello, so, since I have missed certain childhood games, one of them being Luigi's Mansion, so here I am going to play it.
There is a problem though:

When I am at the start menu, it tells me to press "Start" to begin, I can also though press the "A" button to do the same thing, not much of a problem until it gives me this:

"We need to format Slot A to use it"

Ok

"Would you like to format Slot A? Press "A" to choose"

*Pressing "A" just alternates between the two choices*, so does "Start"

Pressing "B" just automatically selects no and I can't even make the Memory Card
can anyone help me?!

The configuration should be correct, but here you are:

Spoiler:

[Craftyawesome]

set a different button to start?

[OneRussian]

set a different button to start?

You think I haven't done that yet? I even turned Start off to see if the two were in conflict, nope, no avail.
EDIT: Did you even look at my config? They are different buttons and are not the same, if you mean a different button than MENU or RETURN then I have already tried that to.

[Ray Raivern]

Why don't you clear everything and set it all over again and refresh it might help.Sorry if it didn't.