I can't seem to get two items I sold (331068 & 331071) marked as sold. Whatever I did shows the items sold on the view offers page only. But the ads themselves still don't show sold. The ad and invoice quantities all show 1 item.

This is because you listed the ads with a quantity of 2. The offers you accepted have a quantity of 1 so the system believes you still have 1 left for each item. To correct this, mark the ads sold a non-member and they will be marked Sold on the main page.