Trivial Pursuit Mistake plus an extraordinary short Fanfic

The first person to be sorted by the Sorting was Hannah Abbott. That is clear. Look it up. Then why does Trivial Purtsuit: World of Harry Potter say that the answer to the question 'Who is the first student to be sorted by the Sorting Hat during Harry's first year' is Hermione Granger! Her surname starts with G! Granger is the first person to be sorted into Gryffindor.