It's because of the new bug reporting system we're testing.
They aren't forums like the others. You're actually not seeing the updated bug reports from the original system that's still open for current bug reports, you're only seeing the bug reports that are in the new system. Notice the forum title for the 'threads' that you're seeing and the forum titles that you have highlighted? Notice how they are different?
Since it's not technically a 'forum' I'm not sure if anything can be done. However, all I can do is ask the developers of the system to consider implementing a fix. They might not since it's a fix for another hack and not the normal functionality of vBulletin.