Mature cards stats not upgrading

Hi, I’m using anki regularly on a day basis and until yesterday I hadn’t any problems. Without reason anki has stopped to upgrade the stats of my cards, for example if I rate several cards with “easy” they don’t show up in the mature stats and this happens either with the daily reviews or custom study. So I upgraded it thinking it could fix the problem (I skipped several upgrades) but the problem still persists. Any advice?

Thank you very much.

Mature cards are ones that have an interval of 21 days before you answer them, so it sounds like they were probably just young. You can use the Card Info option to look up the review history of a card to check on the interval it had.