Element disappearing/reappearing unexpectedly on iPhone

This is an odd one because I can’t seem to screenshot or screen record the problem. My site on mobile has three elements that are disappearing and reappearing unexpectedly on scroll. Where 1 is circled on the picture there should be a header that says Test Flight but only ‘Test’ partially displays when the screen is scrolled down, at which point the Close and Next buttons disappear.

I’m assuming this is an iPhone issue because when I tried to get a screenshot of ‘Test Flight’ displaying the screenshot gave me the opposite of what I was seeing. The issue happens in Safari and Chrome on iPhone

Here is my site Read-Only: [LINK][1]

[1]: https://preview.webflow.com/preview/jamals-sublime-project-9a62d2?utm_medium=preview_link&utm_source=designer&utm_content=jamals-sublime-project-9a62d2&preview=61340d62a4ee4096ea4d789dcac3cb22&mode=preview](http://https://preview.webflow.com/preview/jamals-sublime-project-9a62d2?utm_medium=preview_link&utm_source=designer&utm_content=jamals-sublime-project-9a62d2&preview=61340d62a4ee4096ea4d789dcac3cb22&mode=preview