The Document Guides are not adjusted to fit the width of the document.

Adjust the Document Guides to fit the width of the document. When Scan Size is set to Auto and you are scanning a document that contains multiple page sizes, insert narrow pages straight and as close to the center of the machine as possible. If the document does not stay straight while feeding, use Continuous Scanning.

The Auto Deskew feature was set to Off when the document was scanned.

Set Auto Deskew to On.

The Card Slot Guide is not adjusted to fit the width of the plastic card.

Adjust the Card Slot Guide to fit the width of the plastic card before inserting the card into the machine.