Hunting gnolls in QH I noticed that the groups of three gnoll watchers sometimes respawned (ssemingly at random times) in singles or groups of two and three. Hunting bandits in WK I noticed that they too respawn in groups of two or four. Do mob "camps" reset all at once now?
Oh, and agro ranges...when did bandits begin to agro from a hundred yards away when you're beating the crap out of one of their friends?
Some mobs have always been social and required camps to be broken. In today's Everquest players are overpowered to the content and in some cases this breaking of the camp is not done. The puller pulls 3 mobs and the group kills them all at the same time or in succession there is less lull or splitting. Also somewhere down the road Sony introduced "linked mobs" these mobs were designed to be harder to split or sometimes impossible to split. It's possible that you are running into some linked mobs they spawn together even if killed at slightly different times.
