This is an older issue but I noticed another occurrence this morning so I thought I'd ask about the issue.
Sometime the most recent post in a forum is moved to another forum or deleted but it still appears in the Last Post column for the forum. It would be nice if the topic was removed from there as well so we don't try to find those ghost posts. Two examples, one old, one new are below:
I think the ranch staff may be working on this issue? Again I have noticed something yesterday and today that I think is related. Yesterday when I opened the ranch the servlets forum said 'No Messages' in the Last Post column. A few hours later when I posted on one of the threads the 'No Messages' went away. This morning at 9:10 AM PST I see the same thing in the "Features new in Java 7" forum, the Last Post column reads No Messages.