Duplicate page content each time I add a section with Muffin Builder

I tried adding new section with Muffin Builder. In the wordpress administration interface, everything seems OK when I do. But when I try to preview the modification or when I update the page, the content in my page appears twice. 
Where could that could from? I cannot find the solution and I cannot add section to any of my pages, which is a huge problem.
Thank you for your help.
Here is a printscreen of the duplicate content.

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