In my RSS reader I couldn’t see the latest Spanish-language articles, and as far as I can see it’s a problem with the date. Currently it looks like this.
<pubDate>mié., 14 jul. 2021 13:00:00 +0000</pubDate>
But it should be the day of the week and mouth in English, capitalize and without the dot.
<pubDate>Wed, 14 Jul 2021 13:00:00 +0000</pubDate>
RSS Specification: RSS 2.0 Specification (version 2.0.11)