Hi noustractes
It due to the configuration only, these articles were not assigned to any menu item so that when you click to open, they keep showing on homepage (which includes other modules also).
You can create a new menu item and assign these articles (or category these articles belong to) to that menu item.
I just made a test by creating a new category blog menu item called 'VALENCIANO' to load content from this category + its sub-categories. Now you can see the articles are showing fine now.
You can apply the same for other articles if you face the same issue.