Fixed expiration date issue for some subscriptions

Hello,

For my subscription plans I have activated the 'Fixed expiry date' option because I want each membership to be valid from January 1 to December 31.

At the end of each year, I change the expiration date for the next period. On December 31, 2022 I changed the expiration date to January 1, 2024.

Furthermore, I tried to follow the recommendations of the PayPlans documentation by not activating, in the system settings, Automated Cron.
I use instead the Webcron service (https://www.webcron.org) set with the url https://www.sfgm-tc.com/index.php?option=com_payplans&view=cron&task=trigger
The Webcron service seems to work correctly.

Here is my question:
In my subscriptions list, there are still subscriptions that have not expired when they should.
The status is Active and the expiration date says Sunday, January 1, 2023 1:00 am.

This does not affect all memberships, some memberships have expired and in fact users have started to renew them.

Why haven't some memberships been set to expired?

Thank you.