Because there are 2 less dungeons this season, we've adjusted the threshold at which you season 4 score will show over your season 3 score.
For your season 4 score to show, it must be at least 72% of your season 3 score. For example, if your season 3 score was 2000, your season 4 score would need to be 1440 in order for your season 3 score to stop showing.