My lifetime correctness has been around 75% for the last several weeks. Suddenly, when I check it this morning, it's dropped to 67.9%. Something is definitely odd, since I've been over 90% correct this week.So what is going on? We finally fixed a bug in the way that % correct was being calculated for those "at most one right" questions.
A couple of months ago, we introduced a new "flavor" of question: when the choices are presented are clearly mutually exclusive, the scoring proceeds differently. Either you pick the correct answer and are 100% correct, or you picked the wrong answer and you get a score of 0.
This is different from other questions in which more than choice might be correct, and you get credit for both choosing the right answer(s) and not choosing the incorrect answer(s).
But with "at most one correct" questions, it's more of an all or nothing deal. Our calculation of % correct statistics did not, however, "keep up" with this alternative question style. We were still, say, showing 50% correct or 33% correct, even though you got a score of 0.
Which caused confusion for players and just didn't make sense.
So now you are recorded as either 100% or 0% correct for such questions, which is why some of you will see a reduction in your overall correctness numbers.