Can someone explain the whole PS3 outselling 360 in 07 thing?

[superchunk]

Reference:
http://vgchartz.com/hwcomps.php?cons1=PS3&reg1=All&cons2=PS3&reg2=All&cons3=X360&reg3=All&start=39082&end=39446&weekly=1

360:
Jan 1, 2007 ~ 7,959,854 units sold.
Jan 1, 2008 ~ 16,116,509 units sold.
Difference ~ 8,156,655 units sold in 2007.

PS3:
Jan 1, 2007 ~ 1,232,643 units sold.
Jan 1, 2008 ~ 8,892,220 units sold.
Difference ~ 7,659,577 units sold in 2007.

So, 360 > PS3 in units sold to end users.