Link, image miniature not actualized

Hi!

When we share a link of page on a website, there is this image in miniature that comes with the link.
If we don’t change, WP will put a default miniature, resembling the top of the page
Here you can see the default image miniature
file:///Users/sandrine/Desktop/photo_2024-06-10%2016.54.36.jpeg

We created some miniatures image as the default (pic above) wasn’t so nice.
It worked for all pages, it changed the default miniature to the one we asked for, but the Contact page it keeps showing the default miniature image.
Instead we would like this image file:///Users/sandrine/Desktop/Screenshot%202024-06-10%20at%2016.53.22.png

Does anyone knows how to fix this bug?

Thank you!
Chaya

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