I found that this user (Culip) had a question migrated to Stack Overflow, but his User Name in the comments in the Answers section was not highlighted or clickable.
This threw me for a bit of a loop, as I use the highlighting to quickly glance to see where the author commented on answers.
Unfortunately, I am unsure if this happened because the comment was there before or after the migrate.
Here is a link to the question on Stack Overflow.