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Sometimes, the way the Challenge rating is figured, you may progress a few lvls with the creatures spawning at a set lvl. I've gotten more xp for spawns after a lvl up than before as well. I think that part of the problem is say that the CR changes at lvl 6 for one group of monsters to the next. If you come in at lvl 4, and then get the xp for lvl 5, you would get less xp that way.
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