Young/Mature Cards

I’m currently studying a deck and today I had two cards due which were marked as ‘review’ cards. I got both of them correct and then took a look at the stats and saw the below. Why does it show 2 of 2 in the centre (under the Young section) and not on the right under Mature? The stats show that I have 2 mature cards.



The Answer buttons graph goes by reviews, not cards. By the time you reviewed them, they might have been young cards (interval ≤ 21), only after you reviewed them they’ve become mature cards. So the next review will be as a mature card.