Sections disappearing

Hi there,
I have an issue with one of my onepage website

Sections are disappearing. first the contact section vanished and impossible to recreate. 
Now the exhibition section disappeared too. I cannot create new sections. when I update the page, the new section disappear.
I tried to clone the page, still have the same issue. I updated Betheme, still the same issue....

what can I do??  

thank you for help!!


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