I just encountered this issue today, and found the cause, which turned out to be very strange…
Some background and my solution:
- My published site started showing space below the footer for all pages , regardless of how much or how little content was on the page (the preview site did not show the space)
- I restored previous versions until I found the latest version before this issue began
- I found that the space was given once I removed a Contact Form from one of the pages, as it was included in the template for that page
- I could replicate this issue by deleting and publishing, then undo’ing and publishing again. With no other changes made to the site, no form = space , with form = no space
- I found too that I could put this form on any page in any location, as long as it was somewhere , there would be no space below the footer
- Not ideal, but my workaround was simply to move it out of the way, and set its state to hidden , so that it exists, but is not visible
6.b) EDIT: I found a collection was linked to this form, so I deleted the collection and then could delete the form without the space returning
Here are a couple screenshots showing my published site with and without the form, and the visible space below the footer from each
With form, no space below (you can see the top of my taskbar):
No form, with space below (then the top of my taskbar again):

