I presume you are using the AJAX ZFC to open the document from the server. It is not designed to identically match the development client presentation.
The AJAX client is getting better at rendering the page, but I would avoid complex presentation configurations unless they are necessary.
The IE Plugin will render the document identically as the development client if you are using the same versions.
My users prefer the speed and look of the IE Plugin.
Good luck,
B
