Return of Reckoning

Not sure if this is suppose to be happening, but our mobs that are Grey(trivial)suppose to be giving xp? was killing some lv9 mobs that were Grey(trivial) on a lv15 and recieving xp. I always thought that only green(effortless)++ mobs were suppose to give xp.

There can be some XP on grey enemies, if difference is too big it will stop giving you anything.