I have recently added a new page to my website. It has some embedded code for some real estate 3d virtual tours on it. That page loads just fine if you go directly to the page. https://www.novarealestatephoto.com/pricing-information/3d-virtual-home-tours/
since i can only load 1 photo I have combined the good and page page views, this page shows the video in the center and width of container, and all other videos are filling the entire cell on the page.
but if you refresh that page the video and styling load fine and from there on out if you click around the site and back to the page in question it looks ok. but if you open a new window, navigate back to that page via the drop down menu the page loads improperly again. refresh that page it reloads and works fine.
I also created a test page where i didn’t use Cornerstone and just loaded the 3d tour video directly into the wysiwyg editor of Wordpress and that page loads fine. You can see that page in the Pricing & Info dropdown menu at the very bottom of the menu “Virtual Tour”. this has just a single video at the top. But I tested building it with Cornerstone and it had the same issues as the above page and then I exited Cornerstone and copy and pasted the embed div directly into the text editor and works fine.
Not sure why you link directly to the page https://www.novarealestatephoto.com/pricing-information/3d-virtual-home-tours/ it loads just fine but when you click on the link in the nav it doesn’t but it seems that Cornerstone has something to do with it.