glitched quest requirement?

i was on my elf and i got the "final class" quest. it was wierd since i was never given the option to take the other classes. i did the quest and took the class and beat the mission, but i looked at my quest and it didnt count it on the quest requirements. i took it again and i still didnt get the requirement

You're not the only one getting this problem. I got it myself just now. >_>

I cam across this just now and well I believe it is bugged.