13:14, Sat 10 Nov
If I rotate my iPhone, it reloads the page. That doesn’t seem to happen for any other site other than this one. I’m on iOS 12.0.1. It happens on Chrome and Safari.

Mine doesn’t reload if I minimise the app or go to a different tab, only when I rotate the screen.
14:55, Sat 10 Nov
That's because I wrote the site to reload on resizing the page, both on desktop and mobile.
15:03, Sat 10 Nov
15:57, Sat 10 Nov

There are things that change behaviour at different screen widths, the most reliable way of making sure the site functions correctly is to reload the page whenever the width changes.

Most people don't rotate their screens mid page so the benefits outweigh the downsides.