You have separate even and odd headers. That setting also applies to the footers. (It is a document setting for both headers and footers.)
You need your page numbers inserted in the footers where they are not currently.
Go to a footer that has your page numbers. Copy the contents of that footer.
Then go to one that does not and paste there. You can change the layout if you want.

Header/Footer Settings Recap

See also Numbering Front Matter (Ribbon)