Claws combat pose is bugged?

[America's Angel]

I draw my claws. I move. And then when I stand still, the pose on the left, below, is what my character looks like.

 

A few seconds later, it reverts to the pose on the right.

 

Is this a bug? The animation on the right seems to be for a single-handed weapon. (Mace, Broadsword, etc.)