Last night i saw a strange thing after entering Duty Roullete: High Level, and it wasnt the first time. It happened twice before too so now i decide to come here asking for answers...

I was leveling up my astrologian (actually level 50) and i choose Roullete again, as i do everyday for her, but i got no mob XP... I thought i had entered in a level 60 party, but they were level 50 too and one one them was there for the first time.
Last night it happened in Amdapor Keep Hard, but i also saw that in Sunken Temple Hard and Wanderer's Palace hard.

Whats the problem? Why isnt the High Level Rolette giving XP for killing mobs?