I don’t get it

We have a site to a chessclub. We want to test a new design and theme “news portal”, and for testin purposes we make a subsite “nieuws” and install wordpress. Everything went fine. Then we make the decision to go the main site, install Wordpres and (a little difference ) to install News Portal Lite. To my surprise it is impossible to load picture of a chessboard (404) error : wp-content/uploads/2022/11/extern87/pos01.png

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