This topic shows as "Stack? Heap?" on the list of topics, and has count 0, but when you open it, it shows a different topic title (Topic: Change Object Colors) and there is one reply to the original post.
Interesting. Typically I think this means the post was deleted shortly after being posted, and a new post came in and got assigned the same number. I doubt there was any reason for a moderator to delete this one; hopefully it was the poster's decision. I suppose it's possible there's some other glitch in the system, but don't think it's worth worrying about at this point. Thanks for the observation though.