I am trying to number all pages - every other page is numbered - why?

[Chris Williams]

Hi, I have gone to "Page Number" under Insert in Office 2013. I hit the "Bottom of Page" button and when that came up I choose to put the number in the bottom of the page in the middle. It put in the numbers only on page 1-3-5-7-9 etc. Every other page was numbered and every other page was not. I'm want to see the numbers on every page so that 2-4-6-8 etc are seen also. What am I doing wrong? Thank you for your help, Chris