Question about Cygnus Knights' first job advance

I just returned to playing Maple a week or so ago. My first few characters were getting item bundles and a note about advancing after the first job advance. A couple days later I made a Cygnus. And then another...and another...and another. All of them seemed to get Pig's Weakness instead of the note or item bundle. From what I could gather using Google, the skill is supposed to be the reward of a Pirate quest. I skimmed Nexon's site and couldn't find anything about an event ending which would explain it.

Can someone tell me if my getting Pig's Weakness is what's supposed to happen? Or is it simply a bug?