Header and Footer disappeared in Single Posts

Hello,
I’ve just seen that the header and footer have disappeared from all Single Posts.

Both Header and Footer are included in all website pages, so they should appear as always. I don’t know why, but for a week ago more or less the doesn’t appear in any single post.

I’ve tried to deactivate other plugins and also I’ve tried with old Elementor and Elementor Pro versions, but I don’t find the solution.

Can someone help me?

Thanks

The page I need help with: [log in to see the link]