Bones & movement in Animate CC

when create, say, 5 movieclip symbols, , link them chain of bones, can basic ik.  when start moving things around stage develop poses, inevitably symbols "break free" of bones, , end on place.  i've tried dozen different approaches, can't *&*#*$@ symbols stick bones.  (this seems straightforward issue, 99% of tutorials see keep bone rigs static, never address particular problem.)

 

what missing?

 

thanks

g

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