When playing User Generated Content missions I don't seem to be getting the proper XP when I kill enemies. When the mission starts if I watch my XP, kills seem to give full XP, but after a few I start very rarely getting XP. The +X XP notifications on the side appear as normal, but definitely don't add up to the actual XP I earn.
I've noticed in particular the Ionic Drain/ect super attacks seem to always give 0 XP.
Is there some limit on experience gain in UGC missions in Infamous 2? What is it and how does it work?