Polylang redirects some of my posts to default language

Hi,
I’m using Polylang for a few months and everything was working just fine! I have my website in 2 languages. English as default and Spanish as secundary.

A few days ago, I realized that a few of my posts (not all of them, just 3) can’t be shown in the second language. When i write the url or click on one of those posts, they redirect to the same post in the default language.

This is one of those posts..

https://www.travelsauro.com/es/mochilero-trinidad-tobago-guia-viaje/

When you see the post in english and try to switch to spanish with the flag up right, it doesn’t change.

Did this happen to anyone? Any ideas? Possible bug?

Thank you!!