The headings appear, but there's no arrow on the left, the sections are unexpanded, and tapping doesn't expand anything. Observed on two different iPhones, in Safari and Chrome. Also in Safari and Chrome on Mac in mobile view.
Using the inspector (on Mac) there's no errors in the console until I click a heading, and then I get "Uncaught ReferenceError: mfTempOpenSection is not defined at HTMLHeadingElement.onclick"
The most annoying part of this is that it's only for the main page. All other pages display and operate (collapse/expand) as normal. Anyone have any idea what might be causing this?