If you feel like a subscription or trial should have expired, but you see that it’s still active, then that subscription is likely in a grace period.
For example, this user signed up for a 3-day free trial of the 1-month subscription on May 5, 2020 which should have converted on May 08, 2020. However, the dashboard shows the expiration date as May 24, 2020. This is because Apple applied a 16-day grace period due to some billing issue. Apple will continue attempting to bill the user until they successfully do so or reach the end of the 16-day grace period, at which point the trial will no longer be active.