It seems that the storm totem sometimes doesn’t aggro to new mobs that come within it’s range. This is fairly easily replicable by using the rune prison after summoning the storm totem. Even with the mob attacking the storm totem the totem doesn’t attack back.
I’ve included a few screenshots, posted below, and in all cases the mob that it doesn’t attack either spawns late or was out of its radius when the totem was initially summoned.
Upon some more testing all totems exhibit this behavior, not just the storm totem. I can’t direct them to attack with “A”, and they can even get attacked and still do not retaliate. The rune prison is definitely the most controlled way to replicate this issue. Summon your totems before engaging the prison to replicate the bug.
I also noticed this happening on my totem shaman. I am using thorn, storm, upheaval totem, and crows. Totems will kill a pack then not attack if a new pack gets pulled in from offscreen.