HP 2 - Manual (Page 99)

paper problems
the printer prints on multiple sheets at once
paper weight
The printer may print on multiple sheets of paper at once if the paper is below the
recommended paper weight. Use paper that meets the recommended paper weight.
For paper weight specifications, see the reference guide that came with the printer.
paper may be loaded improperly
The printer may print on multiple sheets of paper at once if the paper is loaded too
far toward the back of the printer. Reload paper into the paper tray, pushing the
paper until you feel resistance.
other paper problems
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For information on clearing a paper jam, click here .
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If an out of paper message appears, click here .