Monster targetting issue

In TotA, the monster targetting is very inconsistent to even non-existant.

For example, I can be running up to a totem that is being banished by a visible enemy, but that enemy is not being targetted nor namelocked. I can be standing right next to the enemy AND facing him, but still no targetting happens.

I am using Poisonous Concoction, which relies on the correct target for the bottle explosions. But without a target the bottles are thrown a certain distance over the enemy I'm standing next to! This is extremely annoying since it is very difficult to cancel an enemy banishing a totem this way. It seems only the enemy Chieftain has consistent targetting.