Column Content empty in Muffin Builder

Hi there...
I am working on a website and have some content in Columns...
You can see the content when you check the website www.lottodream.de
But if I want to work on the content and go back to the dashboard and the Muffin Builder, the column content is empty...

I have no chance to work on the content...what happened???
Until yesterday everything worked fine...
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