Every time my wife prints to our new Canon MX922 printer from her laptop, expecting a single copy, it prints multiple copies-- usually 5-7 copies. When I print from my desktop (right next to the printer - wireless) i get just the one copy I indicated. Ink is expensive!
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Windows icon -> Devices and Printers -> Right Click on Printer Icon -> Halfway down contextual menu, click on "Printer Properties" -> General Tab, Click on Preferences button -> Setup tab, make sure only 1 copy is entered -> click Apply, bottom right corner of window.
in the printer properties window under the Advanced tab, towards the bottom left, you might have a "Printing Defaults..." button. Click on that and look at the Setup tab when it opens. You should only see 1 copy selected there also!