Open the document and switch on the non-printing characters (or formatting symbols). This option should be somewhere on the tool bar at the top of the word document window (looks like a backwards pointing P) – mine happens to be to the left of the document % value.
You should now see why there is a second page (which is being printed) containing one or more non-printing characters. This may be due to a page break (on the first page), which needs deleting or non printing characters overflowing to the second page – again, just delete them until you have one page only.
Having been introduced to Word with the non-printing characters switched on – I find it disconcerting not knowing why characters are where they are on the document (without non-printing/formatting characters showing).