Why there is a different number of hours being displayed on the Timesheet and on the Detailed Timesheet?
This might happen if the user submitting the Timesheet is using the old UI to fill and submit the Timesheet.
The old UI allows to enter time for Incidents, whilst the new UI does not support this function.
The detailed Timesheet on the new UI displays just the hours associated to the Tasks, but the Timesheet is displaying the number of hours associated to the Timesheet being submitted on the Classic UI (including the hours being reported on Incidents).
Incidents are not supported in the new UI TimeSheets.
If using incidents time tracking, we do not recommend to turn on the new Timesheets.