This may occur if:
In [Advanced Settings] for the custom paper you are using, 113: [Adjust Registration Gate Home Position] is set to "-3" or above.
Paper with a width of 160 mm (6.3 inches) is being used.
To adjust the following settings, pre-register the type of paper in use as a custom paper. For details about registering custom papers, see "Registering a Custom Paper", Paper Settings.
When prepunched paper is used, see Prepunched Paper.