Um something similar is happening to me I think... Um... the DML booter won't show any GC games but Wiiflow does, ok? Now um trying to start said games always gets the game in the disc drive to play... I've been going through multiple threads doing what people suggested to others and so far...
although i ended up accidentally changing my nand with no way of going back bc i didn't know you needed a gamecube controller to restore it (i have a wii minus/1.1, which doesn't have gamecube controller support)
and if i find the sd card i have my NAND backed up on, i can not only restore the NAND if i solder the right part in, but i can also put my NAND on dolphin, then i can play dolphin online, like PMEX Remix or MKWii Riibalanced