The Quest File #Stone_Trigger.pl, in poeartha has a typo in it that causes mobs to respawn and respawn when a triggered is activated in the quest file. I just did a CVS update and it's still incorrect.
This line:
should be:
Otherwise those mobs will continue to respawn until the zone crashes. I watched it get to 2000 + and then zoned out. When I zoned back in, they restarted spawning again and again and again :p