Not sure how to fix the current orders, but I can tell you what happened. You have an incompletion procedure that contains one or more fields which have a status group that is defined like standard status group 00. This means the documents are formally incomplete, but this incompleteness does not prevent the item from being delivered or billed.
I would advise to update the incompletion procedure to prevent this behaviour from occurring in the future. As to how to fix the 440, I'll leave that to someone else.