Can’t say what is causing this, but I reported to Elementor support that the portfolio widget on here: https://satoriwp.com/servicios/ is dissapearing whenever I change the screen size. They asked me to deactivate every plugin one by one and when I deactivated GPP the problem got fixed.
I don’t know what property on the customizer could be causing this, I’m reporting this to Elementor and GP to help me find a solution. If you need access to my site let me know.
I did what you recommended and found that the problem got fixed when I disabled the Elements module. Then I went to the hooks I created and discovered that a mailchimp script for a popup form was causing the problem.