ADF "Select many shuttle" does not populate all items available in binded iterator. I don't know whether this is a bug or some other reason, but af:selectManyShuttle in the leading list populates just no more items then defined in the "RangeSize" property of iterator.
To my mind it supposed to fetch all items in iterator in bunches of %RangeSize% (like other components do). But it is like it is for now and the workaround solution is simply to increase "RangeSize" of iterator to reasonable size. It applies to ADF 126.96.36.199.