Because it is only the Hunter that you have the issue with...
Which would have helped to know earlier (assumed this was the Elemental Shaman)...

I'll assume it has something to do with the Hunter option to auto shoot.

Checking my configuration...
If I have (In Options - Combat Options) "Stop Auto Attack" checked, then everything works fine.
I have a mob targeted, and its in range to be attacked, and I'm facing the wrong way.
I press my IWT keybind, and my Hunter turns towards the mob and starts to shoot it.

When I uncheck "Stop Auto Attack", and have the Hunter facing the wrong way.
Pressing my IWT keybind doesn't do anything for me.
Even though CTM is enabled, etc.
As soon as I turn to face the mob, the auto attack turns on.

Check that, and see if that is the culprit.