This week, I've had a 750 point bonus candy pop up twice, but the display gave me no indication of what it was for. Previously, when I've gotten the bonus candy, a pop up would show up saying something line "Bonus Candy Ahead! 500 points for 1,000 map edits!" (or something like that, it's only an example).

In the scoreboard, none of the listed goals are for 750 points, so how do I determine what these were for? I know it doesn't matter in the grand scheme of things, but I'm curious.