Posts on new categories don't show up on homepage

Hello,

I am having problems with my new posts posted under new categories.

This post is inside the new category “strategia” created just for it. If I click on the homepage it doesn’t show up. If I click on “strategia” (categories) there it is.

The strage thing is that if I change the post category assigning “uncategorized” all works fine and the post goes on the top of the homepage.

Can anyone help me?
Many thanks
Matteo