It's just you ;-) Usually "tough" elite mobs give more xp than normal elite mobs. Proto drakes give 5.x kxp rested too - I did nexus yesterday and there were a lot of normal-mobs there (2.6 rested), but the first mobs in the instance was "tough" elite mobs. That mage-dude in nexus is a f.... pain btw. Not hard, just annoying!