I guess we have a Task in JS ..slide jschat/ (or Husten we have a problem)

I have there a issue task in the installed Nextcloud 14

There is a undefinable space, and it comes not from my Theme,
i guess it’s a JS thing because it’s moveable and variable by sliding out …
So i have extra disable the theme to check for my fails, but it is not my,
must be something in the code .

The pictures are :

best regards