I've had this problem only a few times, in 4 years, but it may be worth mentioning here. Perhaps there is an obvious solution to it, perhaps there isn't...
Sometimes, when I beat my record, the alert message "Congratulations, you've just beat your record" doesn't occur, and the program doesn't update the score. In other words, the record is lost
It's got nothing to do with typing at incredibly high speeds, because it also happened at slow paces (such as: while I was training for PI, and I'm not fast at PI ... yet
)