“Nothing Found” Page

Hello! I customized a "Nothing Found"-Page and it shows up when I select a page that I put on "draft" again: https://www.mindgarden-coach.de/hallo-welt However, when I open up my blog site, e.g., it still shows the original 404-page in English: https://www.mindgarden-coach.de/blog/ Can you help me with that, please? Thank you very much. Kind regards, Nathan