This question Add multiple items to a listbox on the same line is three years old and does not have an accepted answer.
But, if you look at the user's profile, the question looks like it has an accepted answer since it has a yellow value in the green box:
Furthermore, the user has been gone for three years, but they got the 2 points for accepting an answer:
All the numbers add up to their 38 point reputation and the user never unaccepted an answer. The question itself does not have any deleted answers on it.
The answer from EMP shows that person did receive the +15 points for that answer:
So what happened to the check mark on EMP's posted answer?