I have seen this a couple times now. Say someone posts in the wrong forum and then people reply to it. A link to the post of course shows up in the Last Post colum. Then a moderator moves the post to the correct forum, but the link to it remains in teh old (incorrect) forum's Last Post column, even though the post is no longer in that forum. As soon as anyone makes another post in the original forum, the new post shows up in that forums Last Post column and the problem goes away. Its not a major issue, just a minor annoyance.