Updating my Avatar & Background image does not update desktop Web

What I was trying to do:

Updating my Avatar & Background image does not update desktop Web

What I expected to happen:

Having them updating instantaneously in all platform (desktop Web, app, mobile web)

What actually happened:

it update on mobile web but not in Web Weird because I update it from Desktop web, it did not update there but in mobile web instead... However, if I reload the page, it update. It took a delay to update. But if I update it from the mobile web, it does not update in desktop web and keep the old Avatar. In summary, Mobile web seems to react correctly, but not desktop web.