Forum "Active Discussions" links to main /tracker for all content, not just forum posts in that forum

If I go to a forum on one of my sites, and view a forum page, there is the "Active Discussions" link, which should just show current/recent forum posts in that forum, but instead it links to the /tracker page which in turn lists all recent content (including non-forum content types). This is a bit confusing because the link is within the forum.

Any ideas on how to either remove this link, or restrict it to show only recent activity in that forum?