Hi Juan,
Please be aware that our demo have been build with Gutenberg editor, not elementor. Gutenberg is the default editor for WordPress and is recommended for many reasons, including its ease of use, speed and lightness. To know more about how to use Gutenberg, I think this article from WP Beginner might help you: How to Use the WordPress Block Editor.
Can you confirm me Elementor plugin is not installed on your website ?
Could you provide us with screenshots of your website please? Please don’t hesitate to comment or highlight your screenshots to help us better understand your issue.
Thank you.