Winner and loser rating are swapped in the calls to expected rating in the function question_victory_ratings in file rating_system/elo_rating/elo_rating_system.php
The result is that difficult questions increase rapidly in rating by playing against easy questions.
Winner and loser rating are swapped in the calls to expected rating in the function question_victory_ratings in file rating_system/elo_rating/elo_rating_system.php The result is that difficult questions increase rapidly in rating by playing against easy questions.