Hello, @manuel-santos,
Please navigate to Porto >> Template Builder >> Product Archive and edit the Shop page layout from there with Elementor page builder, and make sure both sections should be placed under the different containers as shown in this screenshot: https://pasteboard.co/fzDEvsK1lYcg.png
If the issue still persist then please share your site WP Admin URL and Credentials with us under the private content area of this topic so that we can have a look into it for you on your site and help you out.
Best Regards,
PThemes Team.