[Gelöst] Unable to open editor de traduction

Background of the issue:
I am trying to open the translation editor in WPML. I can't get the translation tables with the text on the left as for the pages. Instead, it creates a new page. You can see the issue here: versteckter Link. The issue can also be seen on this page: versteckter Link.

Symptoms:
Unable to open the translation editor. Instead of seeing the translation table, a new page is created.

Questions:
Do you have an idea why the translation tables are not appearing?
Why is a new page being created instead of showing the translation table?