Events Archive not auto-expiring

I have the “Expire last month events” add-on activated since I don’t want them immediately expired. However, when I look at the events archive (did not provide a link because events are limited to logged in users in specific BuddyPress groups), I still see events from Nov 2012, for example.

When I click to edit these past events, their status is “Archived” and not “Expired”.

I manually changed their statuses to Expired, but I was curious if there were any known issues why they might have changed to Archived and not to Expired.