Once a users seat assignment for a particular Permission like Time & Attendance or Project & Billing is removed, his data for that respective Permission will not show up under any reports. This is by design.

To see that users data, enable the necessary seat assignment by going to
Administration –> Users/Departments –> (Select the user) –> Check the appropriate Seat Assignment under Access tab –> Save.

Now run the report and you will be able to see the data for this user.