Similar issue:
Solved: How to export "Log Work" fields to Excel (atlassian.com)
The work log fields exported in the CSV file (all fields) provide the commentary and amount of time entered but rather than the date when work was done, contains the time stamp for when the work log was entered.
This is causing time reporting errors where users update their logs periodically through the week.
Hence work all appears on one day rather than when it actually happened.
I understand this has been a reported issue since 2017. Will this be resolved?