Text field focus on fixed modal auto-scrolls to top

I have a form embedded in a modal overlay. It works mostly fine, but it has a weird quirk when viewing it using Safari for iOS when you tap on the text field and it auto-scrolls you back up to the top of the page, as you can see in the below screen capture on my iPhone.

Would anyone know how I can prevent this?

View screen capture video here


Public share link for the project here
Staged version here.

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