Hey 0nnia,
Thank you for the Advice with the categories, im planning on implementing them soon. Regarding the Bug, it seems to be fixed now. After I wrote the bug Report and went to sleep, everything worked properly again. Im copy pasting my articles from word or Notizen Most of the times, but i think the Problem was my Internet Connection. That day i wrote the articles in my university which uses the Eduroam- wlan System. I think worldanvil and this System dont get along too well, because it happened yesterday again in university, but when i wrote the article again, but from my House it worked perfectly. So maybe its a Eduroam Problem.
P.s. Please excuse my Bad English :)