Top 10 Best Selling Games in the US for the first half of 2015 (NPD)

[DM235]

Surprised to see Witcher 3 so low on the list. VGChartz has the sales at 0.97 million (PS4 + XBO) for the US.
Dying Light is 0.67 million in the US according to VGChartz, but it is listed higher according to NPD?