Paper might be loaded improperly
The printer might print on multiple sheets of paper at once if the paper is loaded too far
toward the back of the printer. Reload the paper into the paper tray, pushing the paper
until you feel resistance.
The printer might also print on multiple sheets at once if different paper types are loaded
in the In tray. For example, photo paper might be put on top of plain paper. Empty the In
tray and load only the paper type that is appropriate for the document that you are
printing.