If you can change it's AI to make it less trigger happy in regards to other players and hostile creatures when we want it to stay in place, it'd be great. :)
Hold Position.
>_>; This works with other summons, I cant see why it wouldn't work with yours. You should also have a control companion tool that'll allow you to specifically direct it. It will not move from the spot. Also this doesn't sound like a bug.
I wouldn't report it if it wasn't working, Ebok! :)
FRICKEN GLITCHEN!