You must set up the odd and even footers separately. If the Odd Page Footer
is not showing or printing, there's a good chance it's outside the printable
area, and that the only reason the Even Page Footer is within the printable
area is that you copy/pasted it from the odd footer. Pasting into a
header/footer, no matter how carefully you omit the paragraph mark in the
copied material and include it when pasting, always results in an extra
empty paragraph.

Display nonprinting characters (Ctrl+*) to show the paragraph mark, delete
the extra paragraph, and then set your footer margin to an amount that will
be within the printable area.

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Suzanne S. Barnhill
Microsoft MVP (Word)