The Project Schedule

When we have team members leave the organization, we zero out their remaining work hours on their timesheet, and submit the final timesheet. I run my timesheet report, and it shows that the users hours have been removed. I deactivate the user, rerun the report then the hours re-appear again, and the hours are back on the timesheet.
Seems we are having issues with the synchronization between the timesheets and the project schedule. (Single entry mode of course, and only accept acutals from the timesheets). It appears that the only way to get the remaining work hours off the timesheet, is to go into each individual project schedule and zero out the remaining work there. (Some have a lot of schedules). Any suggestions? Bug?

Any help appreciated.

I didn't find the right solution from the Internet.

reference:
bit.ly/2FQaGhM
Marketing Video Cost

Thanks!