Bugged daily quest

i have finished daily quest at 69 lvl - plains mission or something like that, which is about killing 12 of each: antilopes, brandersnatches, buffalos and grandels. then i changed to main class (sigel knight) to get subclass certificate from 65 lvl and learn skill. when i turned back to subclass and go to get quest reward i noticed, that npc i talking to me to go and kill those mobs again. when i looked in quests it was finished and there was entry to go back to npc for reward. i am attaching screenshot where you can clearly see what i am writing about.

 

or u just did like most of ppl do-take q on sub /switch on main =easy kill ( or ks q mobs from random low lvls) /switch on sub and recive q reward???
qq now, and go make q again in fair way......