That common because there a couple of aspect that can happen
1) Aggro Spike(can last two-four instances)
2)They can see you
3)boss zone but no boss
4)you walk/run past them and it adds over time
5)The closer you are to the end zone the easier attraction from mobs you get
6)Single player has been known to cause more aggro
7)Mission area aggro sometimes
1) Aggro Spike(can last two-four instances)
2)They can see you
3)boss zone but no boss
4)you walk/run past them and it adds over time
5)The closer you are to the end zone the easier attraction from mobs you get
6)Single player has been known to cause more aggro
7)Mission area aggro sometimes
