A problem with the paths/urls in our website navigation

I have a problem with the website navigation.

The paths of my website are like this: https://www.kopie.de/produkte/drucksachen/flyer

When I make a change to a website (tree structure page with icon house) in the context menu > Advanced > Edit page. Then my paths look like this:


So “/klartext/” is inserted. The path is correct again when the cache is deleted, like the one above.

Does anyone have any idea where such behavior could result from? A screenshot of the tree structure is attached.

Greetings, Richard