I don't know how long this bug has been around, but I just noticed that when you vote to close a question as off-topic, the short descriptions that are provided for each of the migration options are incorrect.
All of them report they are a "Q&A for professional and enthusiast programmers", which is the description for Stack Overflow. Each of the sites should presumably have a unique description.
EDIT: Apparently this is not an issue on Internet Explorer 8.0. I took the above screenshot in Google Chrome (latest version—8.0), but things look fine on the same computer(s) in IE.