Overdue Order Lines by Supplier

I was looking at a copy of the Overdue Order Lines by Supplier report,
PM215, and saw for one supplier, order lines that were appearing on the
report but had a quantity outstanding of zero. Why would they appear on
the report? Is this another JBA glitch? Does anyone know how I can stop
these lines from appearing on this report? Any help would be welcomed.
TIA

The information contained in this email, including attachments, is confidential and may be legally privileged and protected from disclosure by the Electronic Communication Act, 18 U.S.C. 2510-2521. It is intended solely for the addressee(s), and if the reader is not the intended recipient, you are hereby notified that any access, use, reproduction, disclosure or dissemination of this communication by anyone is strictly prohibited. Any action taken or omitted to be taken in reliance on this email is prohibited and may be unlawful. Neither Hutchinson Sealing Systems Inc., Paulstra CRC, the Hutchinson Group nor any of its subsidiaries shall assume legal liability or responsibility for any incorrect, misleading or altered information contained herein. If you have received this message in error, please notify the sender immediately by replying to the email and deleting it from your computer.