With all due respect, I have logged in and taken a look at your setup. It wasn’t obvious that you were aware because when I checked, Advanced Mode was disabled that is why I have showed you the setup. If you just elaborated more like “I enabled the Background Upper Layer parallax”, that could have pointed me to the right direction. Providing details is recommended in our How To Get Support article.
Please note that I’m answering with good and helpful intentions. I’m not questioning anybody’s intelligence here.
Now I see the problem because you have enabled Advanced Mode. I’ve also created a test page and the issue persists there also. I’ve deleted the test page after.
Something conflicts with the Parallax Script. I see a Google Map API setup issue in the console which is coming from EventOn but I temporarily set your page template to No Footer and the error was gone but the issue persists.
It’s tricky now to trace the cause since there’s no error in the console. I suspect the Essential Addons for Cornerstone might be causing this. We can’t deactivate third party plugins because it’s a live site and it might interrupt your site’s operations so you must do the testing.
If that does not help, please try deactivating all the other plugins. Please note that I do not know at this point if you have tried this. If you’ve already done this, please try re-installing Cornerstone.
I’m sorry about the links, I didn’t notice that the URL changed. I’ve updated my previous response now. https://imgur.com/X6UG0Vo