Make a gallery with more than one page.
Then there are at the bottom two links "previous-page" and"next-page".
If the first or last page is displayed, only one of them is a link.
Then the non-link-text is tagged as <em>, while the link has no <em>.
This looks bad.

Proposed remedy:
In file action.default.php l. 285 resp. l. 294 Add <em> tags also if {prevpage}
{nextpage} is link -
or delete <em> where strings are no links.