Tim,
Does it say "NEW BRITIAN" or "NEW BRITAIN"? If it's Britian, then it's just a spelling error that somehow got into the database. If it's Britain, then it somehow isn't attached to what it should be. It's parent location should be BISMARCK ARCHIPELAGO.
To fix it, just open up the locations tree by clicking on Locations. Under $Orphaned Locations$, find NEW BRITAIN. Click on it, then click the Edit button. Under the Parent Location field, enter BISMARCK ARCHIPELAGO and click Add Parent. Then click Update Location and you're done.
Nick |