Shapeshifting problem

[Executor]

I am testing something I'm going to use with Niefelheim in a game,
to fully equip a Jotun Skratti, hydra skin armor, ring of reg, faithful, snake bladder stick, horror helmet, boots of stone and amulet of reinvig.
So first I buff him with quicken self, breath of winter, mossbody or whatever and set order change shape ( to werewolf ) and attack, naturally he kills everybody without any trouble but after the battle he changes to wolf form without any reason, why is that?

I would have no problem with that if he didn't lose all the items when he changes,
and the original plan was to send him in wolf form which is stealthy, and keep the items on a scout, and when I attack I put the items back and sneak the scout in with him.

So, any reason he changes shape to wolf without command???