cant change Logo

I can’t change the logo “Bettinas Geschichten” in the header. Even when I select a new file, the old logo is still displayed. The only difference to the previous logos is that the png file that is now set is transparent. Regardless of which picture I set, these files are always displayed. Even if I completely delete the logo in the header, it will still be displayed.

The page I need help with: [log in to see the link]