[Gelöst] Contents lost in German

Every time I want to publish a post, page, or CPT for my new language (German) I get the response from WordPress that it is saved as a concept. Now when I refresh the page the changes are gone and the title is being changed to: "Automatische conception". It regards a child theme and this is te URL of the website analitiqs.com for English it's: analitiqs.com/en/ and for German it's: analitiqs.com/de/