That is the usual format. It's perfectly fine and won't affect upgrade processing or mileage posting.

You don't need to call CO to see if they recognize you as a gold elite member.

Look at the receipt for your itinerary online by the "View Receipt" link. Under the passenger section will be your Freq Flyer # and any status associated with it. It should say "NW-xxxxxxxx Gold Elite / SkyTeam Elite" (or ST1).

-RM