The ENIGMAS also can display a physical defect in the form of shaking, spinning and/or head arching. The exact reason for this behavior is still largely unknown, but it is seen to a lesser degree in young whereby only one parent is an ENIGMA. ENIGMAS bred to each other may amplify this problem. Some ENIGMAS do not display any problems whatsoever while others reveal abnormal movements only when they are disturbed.

http://www.leopardgecko.com/enigmas.html


To ANC
I don't have personal experience with it, but I would imagine there are varying degrees of it, similar to balls.