Flags Not Appearing

Hi,

In the top right hand of my header (after the search), there is a dropdown area where we offer different language versions of a page on our site.

Before the most recent update the flags were working in this area on all pages, but since the update on posts/custom post types the flags no longer appear on this dropdown.

Is there something I’m doing wrong please?

Thanks,
Meg

The page I need help with: [log in to see the link]