Hello everyone and thanks for your help. First let me explain that I was trying to fix a problem with Elementor that was telling me to call “the_content” so it could open the page to edit. So I googled how to fix it and added a php code on the theme editor. I knew I shouldn´t do it because I don´t know anything about it, but I wanted to try. I don´t know what I did, but now I have a blog that repeats the same content before and after the header and it looks like is a very long page.
I decided to go premium with Generatepress and with Elementor as well, because I thought it would make things easier for me, BUT NOT! Sorry to express my frustration.