Hi, probably you are misunderstanding something.
This link: https://MYDOMAIN.COM/en/products/32-ironing-equipment
is not a Joomla menu link, the ID 32 means that it's a content link and not a menu link.
This is a menu link: https://MYDOMAIN.COM/en/products/ironing-equipment
and if you have linked that category to the menu it's correctly included in the sitemap by the data source 'Menu'
Moreover the sitemap should contain ONLY the canonical link that is https://MYDOMAIN.COM/en/products/ironing-equipment
the other one with the numeric ID is wrong from a SEO perspective.
You could include it in the sitemap activating the 'linkable cats' parameter inside the 'content' data source, but i advice to not use it, it's better as it is now.