My apps are diappearing from App Builder but not WPDA

In WPDA ver 5.5.14 I have created apps and stored them. After having changed column settings to some of the columns, I have stored the changes. When going back to the App Builder, the updated apps don’t show any more. When trying to create a new app with a similar name, WPDA refuses to store it, claiming an app with that name already exists.

The app shows in a WP page, but not in WPDA. Why? Where should I look

 

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