background parallax image disappears on my IOS device

I have a really weird issue on this site that I'm working on. ( The top section background parallax image flickers on my iPhone XR and then disappears. (this one: )

Not there when I refresh. But if I get out of the browser and get back in there, I see it.

Strange. There is the exact same setup in the middle of the page. (this section: ) That is working fine.

Can you guys try it and see if you are getting the same issue? The problem is hard to diagnose because when I preview the site in a simulator, it works fine.