Guild Wars 2 Forum - Bugs: Game, Forum, Website

Somehow, I cant complete one hint,
Hints > Social > Mailbox is Full
although my mailbox already filled up.
<screenshot attached>

Already happened since the game launch, have tried to fill up my mailbox several times, but never done the hint.
Have any idea why?

(edited 2013-04-22 04:06:50 by fiasse.4762)