Parallax Problem

Hello,

I have created a webpage with PageBuilder.

Very happy so far, except for one thing:

The parallax effect is scaled wrong, until I scroll or resize the page. Then it starts to work correctly.

The same problem occurs on Chrome, Edge, iOS Safari, and Android Chrome. It happens with all of my images.

Any ideas?

Here’s the site:

http://davidlightbown.com/david/

Thank you!

https://wordpress.org/plugins/siteorigin-panels/