Mirrored furniture moves from its position when opened out of its horizontal bounding box.
I think a problem similar to this was already mentioned before, an elevation change with a velux window. I'm not sure but I might have reported a similar problem before too.
But this is specifically a mirrored object problem where the furniture moves where it should stay in place. Look at this image:
On the left the wardrobe as I created it. Next the wardrobe with a mirrored copy next to it so the handles are both in the middle.
Now I open the doors for both of the wardrobes. The mirrored wardrobe moves along the X-axis so its bounding box remains where it was, resulting in moving the whole wardrobe to the left. This should NOT happen. With an mirrored object the mirrored position should be taken into account when redrawing the furniture with an openend door, i.e. the wardrobe itself should stay in place.
To check if it's a specific left-right problem I created a copy of the wardrobe where the hinges are on the right instead of the left as on the original wardrobe. When I open the new wardrobe it stays in its original position as it should. This means it is a problem with deformations on mirrored furniture. I tried the same with one of the default eteks doors and the same problem occurs, meaning it's not a problem with the object itself.
Now I could create a copy for every piece of furniture that needs a mirrored counter part with a deformation but that would defeat the whole purpose of mirroring furniture. Also this might be a very easy problem to solve because I assume that with the drawing of the object the mirrored status is know but just not taken into account for expanding the bounding box in the correct (mirrored) direction when a deformation changes the bounding box.
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