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Perhaps the encounters were respawned a few times, but the players left the area without fighting, leaving the monsters around to build up.
Another variable to consider is the new 1.62 encounter tweak that now calculates encounters past 20th level. This will cause and harder spawns to occur from an encounter if an epic level character triggers it. If it is triggered a few times and the players leave before killing the spawns you'll get big time monster build-up!
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