Here is why you see the product status as "opted-in" in AdNabu
If your product status is "opted-in" in AdNabu and approved in the Merchant center, you need to check if you have signed up for shopping ads in Google Merchant Center.
Merchant Center can show products as approved even if the products are only approved for free listings.
If you have signed up for shopping and still see the product status as opted-in, please click on the "sync approval status" button to fetch the current merchant center product status.
If that does not help, feel free to contact our support team to help you with the issue.