Guild Wars 2

was doing this event today at 9am UTC +1. got 17k xp and 360 karma +-.

Same day 20 hour later got like 890 xp and 17 karma, NOT bad luck.. it happen every time I do this event (like 6 times repeatedly).. why i get only 890 xp?

btw i am on PvP full exotic set.. 3000 aoe dmg.

Problem fixed by switching for another quest..when i finished it and get back to this event i got right amount of xp and karma.. so maybe is it just anti-bot system.