Maybe because the Kings website has him listed at 6'3 here http://www.nba.com/kings/roster and ESPN has him listed at 6'3 here http://espn.go.com/nba/player/_/id/2528447/ray-mccallum
A lot of players grow from college and their rookie year. Those measurements you have are old.
A lot of players grow from college and their rookie year. Those measurements you have are old.
Heck, I've done that too. I remember my surprise at being 2 inches taller and 10lbs heavier in my high school football program. In fact our whole D-line was. Intimidation and all that.