Attached Link: http://www.atomic-knights.de

Hello everyone, I am doing a poseable keyboard at the moment and when I thought I was done with it I noticed some really strange thing I can not explane.

ok, let begin :
every single key is a child to the frame
every key can be rotated for 5 degrees
if I "push" a key the frame somehow transforms in the direction the key moves.
if I "push" more key the frame transforms more.

on the picture you can see : none key pushed, one key, six keys.

The frame does not rotate as you can see it is only "deforms" How can I avoid this unwanted effect ?

I edited most of the dials and set limits in the cr2 code but I did not use morph targets or anything in the object.