I don't think there's anything wrong with the charts. Switch is coming in at a time when all consoles are down from the holidays. Whatever sales it gets it's going to do more, currently, than PS4 and XB1, hence already being number 1 on the yearly.
Basically, it's a brand new system and it's going to sell out of all shipments at every retailer.
Formerly ilovegirls69 :(