Found the issue!
To hide the category from the blog’s snippets on the bottom of the page, I’ve added the following custom CSS
.category {
display: none;
}
It worked, but it looks like it inhibited the display of all the category section (…or something like this…).
Removing this custom CSS the category menu started working again.
To achieve my goal to hide the category from the blog’s snippets I’ve added this custom CSS:
h6 {
display: none;
}
Not so beautiful, since I’m hiding all h6 titles. Looks like htey are the only h6 titles used in the site, so… If someone has hints about how to hide the category, I’ll be glad to hear.