I don't think your math is wrong, and nor is it an error.
Not all the monsters use the exact mechanics the players do, there are a few odd critters who are 'slightly off' by player build, but thats how they were intended.
Augh, too late. I noticed my problem: I has the Acrobatic feat (+2 fly and acrobatics). And now I can't delete the thread. Oh well. Egg for everyone! (if you're willing to eat it off my face).
Acrobatic
You are skilled at leaping, jumping, and flying.
Benefit: You get a +2 bonus on all Acrobatics and Fly skill checks. If you have 10 or more ranks in one of these skills, the bonus increases to +4 for that skill.
Augh, too late. I noticed my problem: I has the Acrobatic feat (+2 fly and acrobatics). And now I can't delete the thread. Oh well. Egg for everyone! (if you're willing to eat it off my face).