New post does not show it remains hiddent until new posting

Hi,

I’ve got an strange behaviour with this theme.
When I add a new post, regardles of the assigned category, the new post does not appear in the blog, but appears when I go to the category page.

The same happened whith the prior posted post in the blog page, but with the new posting, then the previous “hidden” one appears in the blog.

I.e. it seems that the last post remains hiddent in the blog page until a new post is published, which is in turn hidden, and so on…

Any suggestions? I don’t know where to search anymore.

Thanks in advance.