The audit timestamp in the Modern UX is showing a different time zone than what is configured in Account Settings. This is causing the Classic audit timestamp and the MUX timestamp to not match.
All supported versions
This is working by design.
The MUX Audit grids include a Timestamp within the Changed Date attribute, displaying the time based on the Time Zone of your computing device. The displayed time is NOT based upon the Classic setting configured by the end user under Classic > Home > Account Settings >Time Zone.