Hi. I think your custom script is causing the problem.
Script for scrolling the page with the keyboard, or a script that prohibits right-clicking, which is completely useless, as you can see in my screenshot (I got to your code anyway and can copy anything ;) ).
Keep in mind that the SP PAGE Builder has a context menu that can be invoked with a right click. By prohibiting the right click you are breaking this.
When installing custom scripts, always check your browser console for errors and conflicts. You cannot install anything on the site. It's important to take care of the ecosystem.