After contacting the elementor pro, I followed their debug steps:
1. disabled all the plugin,
2. changed theme to Hello Elementor,
the problem is gone.
So the problem is something related on the theme or theme settings.
Could you please help?
I really need you on this because I have no idea to solve this, even I as a web developer.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.