Statistics are not recompiled automatically - the server would completely overload if we did that. Instead we cycle a script once every minute that recompiles the statistics for one puzzle at a time. We process 1,440 puzzle statistics a day, so it generally takes about 3 weeks before a puzzles stats are reconfigured.
Again, its only an issue for new quotes. I now regret making statistics visible at all for them, its causing too much confusion.