Either one of the softwares thinks diffrent how to handle shutter information for fixtures. Vectorworks handles shutter as in the real world using the shutters, eos is more of a wysiwyg aproach, same as in encoder display.
Personally, i think either allow to choose "flip shutters" during import.
Or just change the vectorworks plugin to flip it on export.
Personally, I am all for updating the export plugin.
Cheers guys.
Versions used:
eos 3.1.1
vetorworks2020 with most recent export plugin