you are talking about an actual retail (original from a shop) disc ?
or a backup of the game? what would explain why you use softmod chip to load the game and not the disc channel.
are you sure you skipped the online update when you reconnected your wii to your wifi connection?
if not you are not on v3 anymore, recheck in the wii settings -> top right corner.
you did the update? then you are on 4.3 for sure and need to resoftmod the hard way (softmod any wii guide linked below).