The numbers here are accurate when you consider weekly sales. It's just that being off by a little bit weekly makes numbers really off down the line.
Its really off for some games, dunno if GoW3 was fixed or not but it was undertracked despite official numbers. Usually after official numbers are out vgc adjustments reflect on that. And I wonder how vgc tracked cancelled games(A:CM WiiU) or unreleased games (EA Live PS4 version for the week of nov 15).
I also doubt Fifa sold such a small amount during the PS1/ early PS2 days. It was crazy popular back then and it is still crazy popular right now.