The site is configured to allow a Rejected/Cancelled/Submission Failed envelope one time. When an envelope is copied, a draft is started to allow corrections to be made in. If an envelope is copied more than once, information from the envelope, notably the Party Information, is stripped and unable to be recovered.
To resolve, you will want to resume the original Draft that was created when the Envelope was first copied. If the draft is no longer available, you would want to start a new draft to make corrections in, either by starting a new case or filing into an existing case number, if one is provided by the court.