Footer changing position

Hi all,

I am having some problems fixing my footer position to the bottom of the page. I would like to keep the footer where it appears on rachelstubbings.com however on some pages the footer moves up the page, as you can see on https://rachelstubbings.com/films/ This is a custom page template, all I have done is remove the sidebar so can’t figure why its happening. It also occurs on https://rachelstubbings.com/pictures/ so I’m sure the custom template has nothing to do with the problem.

Any help gratefully received