Solution for this topic
@nicolas Could you please check it now?
I logged in to your site and saw the theme file woocommerce/content-single-product.php is modified so it was not displaying properly.
I restored the file to original and it is working fine now.
Please note if you make changes in the theme file then you have to make these changes again after theme updation as changes made in the theme files get lost on theme updation so we recommend to make changes using child theme.