Game Mechanics: Agro issues?

[Nevard]

Example:

I am a 34 necro. I send my pet at target A to kill. I do not cast any spells or even touch target A. I run away towards Target B to kill on my own.

I cast Vampiric Curse (very high agro spell) on target B but I end up on Target A's hate list at the top and Target A comes straight after me even though I never touched or casted any spells at him.

Just seeing if anyone else has experienced this