This behavior seems to be caused be the re-import implementation as reported here:
https://github.com/opnsense/plugins/issues/2721
Renewal calculates 60 days for the import date instead of the issue date of the certificate.
[SOLVED]
It has been fixed by freanki with this patches:
https://github.com/opnsense/plugins/issues/2721#issuecomment-1005589449
Thanks to everybody helping and freanki for fixing this!
https://github.com/opnsense/plugins/issues/2721
Renewal calculates 60 days for the import date instead of the issue date of the certificate.
[SOLVED]
It has been fixed by freanki with this patches:
https://github.com/opnsense/plugins/issues/2721#issuecomment-1005589449
Thanks to everybody helping and freanki for fixing this!