Elite Mark Incorrect amount of seals as reward

I just killed Skogs Fru, the rank B in Middle La Noscea. Joined a party and wailed on it from the very beginning... but I only got 5 seals as a reward. I had accepted the weekly bill to kill it for a reward of 20 seals and everything, and I definitely did my part to take it down. Why did I only get 5 instead of 20?

EDIT

Turns out the chat log just pushed the notification of 20 seals out of sigh, leaving the 5 from contribution bonus. Whoops. ignore me.