When visiting http://reading-web-staging.wmflabs.org/w/index.php?title=Roman_Catholic_Diocese_of_Darwin&mobileaction=toggle_view_mobile and clicking the issue in the history section, the section number 2 doesn't correspond with the actual section number (1). This will cause problems in our instrumentation.
This appears to relate to the mobile-toc that is added by MobileFrontend which contains an h2.
The fix is relatively simple - updating the selector in Page.HEADING_SELECTOR or providing a function that filters out the h2.