Hi Lars,
As this is a third-party editor it’s not something we can easily change, but you can try this:
When you have copied your text from word, right click on the text box you want to paste into and instead of just Paste, choose “Paste and Match Style” (or the PC equivalent - I’m on a Mac). I believe you can also use Ctrl-Shift-V (Cmd shift v on a Mac) as a shortcut. That might hopefully stop it happening?