The Great Northers Wall?

Hi, Yesteday i played with my lvl 10 char, I got an problem.. When i and a party did make the mission The Great Northers Wall with bonus . Then next day i wanted to lvl up my Char again, but.. Then mission The Great Northers Wall wasen't made ! What is this? I am 100% sure that i made it , but next day i didint had that 2k xp from mission, nothing :/ Some1 can help?

It's probably because of the rollback.

That means i most do it again ? -.-

You are correct.

Could be worse: I did Thunderhead lastnight, finished a little after 9pm GMT...
Guess who has to do that lovely mission again?

That just plain s*cks. I did Dragons Lair but I like that mission and bonus.