Did you use one of the six resume templates supplied with Office 2011? If so, which one? Otherwise, what is the source? Without knowing which specific resume template you used there's no way to be sure.
None of the supplied templates include page numbers on the 1st page. Nor does Word have any capacity to arbitrarily add page numbers. If they actually exist in the document there would be some visual indication.
Do you have the non-printing characters [¶] displayed to help determine what is in the location where the page number is appearing? Have you tried displaying Field Codes [Option+F9] to see if anything shows up in that space?
Also, what is the file type of the document? Are you uploading the actual Word document or some other file type. [If it happens to be a PDF for example, that involves the Print subsystem of OS X. Some printers have a feature that adds page numbers.]
If you'll post a copy of the Word document or a copy of the template on a web server & provide a link to it perhaps we can help figure it out.
BTW, it most likely has no bearing on this issue but I notice that your installation of Office 2011 is behind on updates, 14.3.9 being the current version.