WiiU Overtracked, 300k+, Xbox One-Wii U gap down to 550k?

[Gammalad]

tsogud said:

Gammalad said:
Every news article I read says the Wii U sold 7.29M not shipped 7.29M, so why is everyone saying the Wii U is overtracked by 300k+? If Vgchartz is to be believed then the Wii U is only about 50-60k overtracked.

I know, I'm confused too. Even on their own website it shows it sold 7.29 M, not shipped. 

http://www.nintendo.co.jp/ir/en/sales/hard_soft/index.html

Glad I am not the only one confused here...