Hmm, that is very strange.
You can see the code at the bottom right here, telling it to cover and not repeat: https://www.screencast.com/t/XuZnlzLm0
I also stretched your site out over two screens, and couldn’t get any repeating.
Do you have anyone else you can get to check it out on different computers? Just want to see if we’re working with something specific to your computer.
I did notice you have query strings removed, which makes browser caching extra aggressive.