Hi carolechagan,
To try and resolve the issue, you will want to ensure that the photo paper is loaded in the portrait orientation in the rear tray of the printer. You will also want to ensure that the paper size and type selected in the printer driver and program you are printing from match the paper size and type loaded in the printer.
Should you continue to experience difficulty, we ask that you please call 1-866-261-9362, Monday - Friday 10:00 a.m. - 10:00 p.m. ET (excluding holidays) for further assistance. A Canon technical support representative will be happy to help. There is no charge for this call.