Sitemap problem

Dear Sirs,
We have a problem with the generation of the sitemap of our website.
Here is the url
https://lussoprodec.com/sitemap_index.xml

As you can see, they are dated July. We have followed all the steps about cleaning the cache, as well as changing the number of pages to index in the sitemap and regenerating the permalinks, but there is no way.

We have followed everything you notice in this post https://rankmath.com/kb/exclude-sitemaps-from-caching/ and including the directives in the .htaccess and they are still not updated.

Finally we tried to change rank math by seo yoast and generated the sitemap well. In rankmath it says /news/ when it really has to say /el-blog-del-cafe/ in our entries.

https://lussoprodec.com/el-blog-del-cafe/uncategorized/el-cafe-engorda-verdad-o-leyenda/

Rank Math is generating correctly the titles and description. We can’t find what the problem is. We have uninstalled and installed the plugin several times.
Can you help us?
Thanks in advance

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