The disappearing Miis!

An email sent in by reader John…

My friends and I were going to play Wii tennis, but they decided to be morons and just click on the characters in the selection screen. Instead of waiting for them I just click start game. When the game started only one human player was in and the computer had assigned three randoms. The weird thing is that two of the randoms were the same character. When the game started only one of the Miyu miis was visible, but the other one was playing too. The other random was the mii Chris, he was invisible too, but had a shadow. All of the Miis could play and whenever invisible Miyu swung, visible Miyu did too.

Anyone else have any weird glitches happen?