Donkey Kong Donkey Gone

So ... I plopped in my Donkey Kong game about ten minutes after turning it off.
I had gotten a couple new bannanas and ended up with a total of 100.

I went back to the saved games and ALL THREE games were gone. Not one, but
three.

WTF?
--
"Argh, the laws of science be a harsh mistress." - Pirate Bender
"If you want to say something relevant to this particular discussion, or
something vaguely logical, you might try to come up with it now."
-- Kettir, to me