HI, I added on my front page the site header element to merge it with the content. I suspect it causes a huge overflow when pressing the mobile menu button.
I disabled all plugins and custom functions except GP Premium and GenerateBlocks and activated the parent theme. and it is still the same problem.
It only happening on the home page where the site header element is running to merge the header with the content.
From the link you shared first, I’m not experiencing any issues. Is the 2nd link a staging site? Can you provide admin login credentials to it so we can take a closer look?