Deadmines reset question

Hi all,

I was in a Party of 2 doing the Deadmines. Up until we blow the door up with the canon If we die the monsters we have killed are still dead, but after we blow the door up with the canon If we die the monsters we have killed are back. what happed? What did we do wrong?

Thanks in Advance

Dave|||maybe you took too long to reach that point and the monsters started to respawn. or you were out of the instance for more than 30 minutres and there was a soft reset.

Also note that there are 3 or 4 patrouls of 3mobs each on the way to that door, which spawn after you passed them and come from behind.