If changes were made to the product, there's a chance some of these changes could have affected the automatic syncing of your orders.
One of the main reasons we see when orders don't get automatically synced with us, is when the product vendor is changed from being Subliminator to something else.
To still be able to process those orders you'll have to place a manual order from your Shopify dashboard. Go to Orders → Create Order and place the order manually there. Make sure you add the shipping address in the manual order as well. This can be done on the right side of that same screen.