Categories not showing posts

Hi, I recently started this blog. I think I fucked something when trying to get it multilingual with Qtranslate X plugin due the /en/ /es prefixes.
But now, even by disabling it I can get it fixed (also not sure it made the problem).
I’m not very experienced with WordPress specifically and I can’t realize the reason of the problem. You can check on “security” or “updates”, where articles should be shown without posts.

Can someone realize the problem?
Thank you, regards.

The page I need help with: [log in to see the link]