woocommerce is not showing product gallery

Hi,
Suddenly, when adding new products, the product gallery does not show up. Old products (products added some time ago) will show the product gallery. I have tried Storefront and there the result is the same: old products show the gallery, new products won’t.
Link to the page I need help with is mentioned above.
A page where the gallery shows: https://de-pelikaan-lochem.nl/product/taiwan-oolong/
Thanks for looking at it,
Jos Vermeulen

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