Duplicating makes selected shape change back to previous form

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This behavior is new to me: in Visio 2003 sp2, I create an object by
dragging from the stencil and then resize it to meet the needs of the
chart I'm making. However, when I select that modified shape later and
duplicate it, the duplicated object reverts to the same size as the
original object and not the size/shape of the modified object.

This makes it hard to create uniform org charts with boxes the right
size, because I have to resize each one.

Any way to get a duplicated object to retain its modified size rather
than the size of its parent from the sencil?

Many thanks.