We can fix this by enabling "component video mode" in some games..
- Go into the operations manual for the game.
- Then hit Z+A+2
more info here.
Wii Component Cable Interlace mode
The mode can be enabled by accessing the operations guide of the game, and (with the Nunchuk attached) pressing the buttons Z + A + 2 simultaneously.
The mode can be disabled by using the same method, but with the button combination Z + A + 1 instead.