So I am kind of confused here by the XBONE global sales number so I was hoping someone could help me out. 

EU sales are 402k according to http://www.vgchartz.com/article/251434/ps4-vs-xbox-one-europe-launch-sales-comparison/

While NA are ~1.084 million 909k + 175k 

Add in ~80k for Australia and we get 1.566 million.

Yet we have 1.8 million on the front page where are these 250k sales coming from that I overlooked. 

Australia, Austria, Brazil, Canada, France, Germany, Ireland, Italy, Mexico, Spain, United Kingdom, United States and New Zealand.

No clue bud. I think its really hard to keep track, just because they use rates alot to determine sales, but when consoles sell out, those rates get all screwed up. Wii U's and 3DS's were overtracked because the Mario and Zelda bundles kept selling out.

the numbers of the front page have added one more week which there isn't already an article about.

here in Brazil, x360 dominated 7th gen(certanlly more than 50% marketshare), and XBone is being heavily advertised...

Also, ps4 is almost 2 times the price of One.

I think One is selling very well here.

Week ending 7th December.

Mexico is included in the NA numbers, and I seriously doubt the extra 250k came from brazil and nz. 

Especially considering this article on Brazil http://riotimesonline.com/brazil-news/rio-daily/new-xbox-missing-from-brazil-stores/

The guys pointed the others places plus the week end Dec 7 is not up on the numbers yet... just in the graphs.

Who knows all I know is that Xbox One has sold more than 2 million consoles in 18 days. VGChartz is never going to be 100% accurate so why bother asking about specific numbers.

pretty much this.