I'm guessing the other games are Mario ones? Because I believe some Nintendo games save when you shut it down in addition to manual saving. I just tried using home + x with Kirby, and I never got any kind of message like that.That's what doesn't make sense... I save in-game... and then I do the Home + X... I get a message saying it doesn't save.
But other games, I get the message saying that it's saving.