background parallax image disappears on my IOS device

I have a really weird issue on this site that I'm working on. (http://ca.almostdone.website/) The top section background parallax image flickers on my iPhone XR and then disappears. (this one: https://snag.gy/a68F3l.jpg )

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: https://snag.gy/gYnWBe.jpg ) 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.