The 2 dupe channels are just there for nothing. I think you can get rid of them by formatting your wii, but you will lose your VC games and every chanels (you'll be able to re-download them for free).
btw i feel this a good time to remind you guys that sea of thieves was made by rare, who also made DKC1-3 and DK64, alongside banjo kazooie and conker's bad fur day