Thanks for your answer,
Both screenshots were tacked at the same time. The incongruence between the parameters in the settings width the result is why we wrote you.
We need to list all the results in category ordering.
I think the problem starts when I add new articles to this categories.
To confirm it I duplicated the categories and articles. Now, the article copies take its order correctly.
Soon I must add some new articles to these categories. Then I could confirm if this trouble persist.
If you want to check how it works in our website, the link is:
www.mim.cl/index.php/busqueda-rel-curriculares-2
Thanks