Ape problem with CMB / CMD

[RiTz21]

The bestiary (and PRD) lists the Ape's CMB and CMD as:
CMB +6; CMD 18

Yet, my tool tells me it is CMB +5; CMD 17

So for the Ape:
CMB = Base attack bonus [+2] + Strength modifier [+2] + special size modifier [+1] = 5

and

CMD = 10 + Base attack bonus [+2] + Strength modifier [+2] + Dexterity modifier [+2] + special size modifier [+1] = 17

So is this a Bug in the Bestiary, or is my Tool missing something!?

RiTz21
http://TheOnlySheet.com

[Tom Baumbach]

Dire ape's CMB & CMD are off by one also. (I'm going to guess it's errata, not a mysterious missing bonus.)