Archive insists on displaying marker numbers.

No matter what I set it to display, the archive always wants to display the marker number. It was initially set to only display the title of the marker (since the markers were created to include the chapter numbers), but it insists on displaying both the number and title. This problem persists across all themes, including the defaults.

Interestingly, when the archive is set to multiple pages, it only displays both number and title on an individual chapter's page. When set to a single page, it displays both number and chapter for everything.