Forums & Containers Lists do not show updated Author

If I change the author of a forum post, the new author name appears correctly in the list for that particular forum, but the old author name still appears in the "last post" column of the (top-level) Forums List and of the container list (if the post was to a forum that is in a container).
Example:
This list shows "last post" author as "admin" for "iPhone" forum in "iPhone & iPod" container in top-level Forums list.
This list correctly shows the last post for "iPhone" forum now authored by "caf" (which had originally been authored by "admin" and then was changed by "admin" to have new author "caf")