Additionally, tapping any item in the sidebar gives unexpected results. For example:
I guess something funky has happened where the display has become decoupled from the actual tap targets?
Scrolling the page whilst typing in the search field puts the cursor in the correct position. If you add or remove any text in the search field then the cursor is misplaced once more.


Confirmed
Interestingly this doesn't happen on https://www.golfbuzz.com
This has been fixed on iOS 11.3.
It is not a website bug, however. It is an iOS bug caused mostly by modals.
See https://hackernoon.com/how-to-fix-the-ios-11-input-element-in-fixed-modals-bug-aaf66c7ba3f8 for more information.
Official WebKit bug report at https://bugs.webkit.org/show_bug.cgi?id=176896.
Closing as wontfix then.
Most helpful comment
Closing as wontfix then.