F5 - System Times of Devices Do Not Match

have you set both active and standby node to ntp time server with correct time?

if the difference to ntp server is less than 1000 seconds, the system should drift the time by itself until they match the ntp server.
larger than 1000 seconds will need restart ntpd.

https://my.f5.com/manage/s/article/K35119082