The leaderboards seem to still be broken. I wouldn't worry about it too much, just keep studying. Ben already said the scores are being recorded correctly even if it's not displaying so it will be fixed eventually.
I'm not sure what to tell you. For a while my "daily" leaderboard was totally empty with just my name on it and a score of 0. That seems to be fixed now. My scores on the weekly leaderboard and the weekly score that shows on the "Home" tab were also different before, but it seems to be working properly. All that's really left would probably be the fact the leaderboard updates quite slowly, but maybe even that has been improved without me noticing.
THe scores are now just "learning" points, not learning and creation points, which may account for the difference; a new "creators" leaderboard is on the way.The leaderboards are currently updating every five minutes. This will speed up and we may return them to being real time in the next couple of weeks, as long as that doesn't put too much strain on the resources.Please do let me know if you spot any more anomolies and we will get them sorted ASAP.ThanksBen