Edit page different from preview or live site – Videographer

Hi,

I’m a beginner still, don’t understand code at all (neither CSS nor HTML)…
I’m encountering the following issue: for some pages, but not all, the preview or the live site do not match what I do in the edit page… In fact, it almost doesn’t show anything at all.

I tried deactivating all plugins, except Guthenberg, without which the theme doesn’t work, didn’t fix the issue… I’m working with a theme called “Videographer”.

Thank you.

Elie

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