since the paths:
go to different directories, the require_once directive thinks they are unique files so includes them both.
it seams like you are editing files that already had framework builder applied to them, but the files are at a different location relative to the root of the Dreamweaver site so the require once line is being added again.
the software will expect to find helper files like webassist/framework/library.php
at the root of the site defined in Dreamweraver, if they dont exist at the DW site root, thye will be recreated.