Jiggle bones A.R.T problem

i cant found that setting.
i testing with jumping animation in maya.
its parented to spine3 bone and its not jiggling.
but i made second test.i created 2 jigglebone. first jigglebone connected to spine3 second jigglebone connected to first jigglebone and first j.b. not jiggling but second one is jiggling