Game Mechanics: Pet Targeting NPCs

[Grozmok]

Pet proximity to mob A and mob B is very close. I almost always pull the mobs directly to the group, right where the pet has been told PET GUARD HERE as to not proximity aggro other mobs (since my pet is such low level).

Pet has not taken any damage from either mobs. I've also disabled pet taunting to reduce chances of getting high on the hate list of mob A and mob B.

In this particular case I'm pulling mob A with the hostile action via the ranged attack and mob B with social aggro.

I usually send in my pet to attack mob A when they've reached the 'camp'.
Typically, I'll let mob B beat on me while I'm attacking mob A.
At some point during the fight, my pet will decide to attack mob B.
It even appears to ignore my commands of PET BACK OFF, even if I immediately follow it up with PET ATTACK mob A.

It seems like target switching is wonky when I try to get my pet to attack my target AFTER it's already been told to attack something at least once.