Unable to Update Lower Hour/Meter Readings in PM

In the PM Backlog, the hour and meter readings were input incorrectly to a much larger value (ex: 180,000 HR instead of 8,000 HR) showing 999 %due in the backlog. The meter readings were then updated to the correct values, but after the PM update is run, the readings revert back to the incorrect value. We have attempted to update directly in the backlog, delete the WO then update, "complete" the PM with the correct hours and dates, do a meter changeover, yet every time the PM update is run, the old values come back even if afterwards the meter