The header is the content of the menu, the footer is below the menu in the editor.
Both are displayed at the front-end thorough ‘the_content’ filter.
Try with some default theme like twentysixteen to check that the functionality works correctly. If you still have the problem try disabling other plugins.
Cheers
Moderator
Jan Dembowski
(@jdembowski)
Forum Moderator and Brute Squad
For pro or commercial product support please contact the author directly on their site. This includes any pre-sales topics as well.
As the author is aware, commercial products are not supported in these forums. I am sure they will have no problem supporting you there.