This is the 2nd time this has happened.I was in Kallisti Wharf Toting in costumes to get the Whispered Rumurs for the Malleus Mundiand noticed that the xp for an EB Hollow Reaper was reduced. It originally was giving 145,702 xp then dropped to 97,135. The influence given was correct though. I was not using any xp boosters at the time.
I put in a ticket and was told to post it in the Report Bugs Section here.
I continued to play and did notice that even the ToT minions were even giving the less xp.