Particle system domain box deforms the character (smoke effect) I've been trying to create an animation for a creature where he slams the ground and there' s shockwave effect right after the animation. 

However, I moved the domain box, where the smoke effect takes place right under the creature that slams the ground and it suddenly deformed the creature (so the creature fitted right in the domain box somehow).

The domain box seems to have animations saved somehow. Maybe this might cause the problem.

I am not sure what causes it.
Your rig object has a non-uniform scale, giving the character a squished appearance.

To fix this, clear the keyframes on the scale (as the scale doesn't actually change, this won't affect the appearance of the animation), then copy the X or Y value to the Z value:



This shouldn't have been caused or otherwise had anything to do with the smoke simulation. Perhaps you may have accidentally changed the scale while Auto keyframe was enabled (as it is in your screenshot)?