SLA Due Date reset/clear

SLA Due Date reset/clear

Can I get some clarification on how the Due Date is reset/cleared during a ticket lifecycle?
Take the following example:
  • A Ticket is opened with a Medium Priority
  • The associated account has an SLA
  • A Due Date is set by the SLA config to 8 hrs
  • The problem is resolved, a response is posted and the ticket is closed within 4 hours.
  • The SLA has been met
  • The next day the client re-opens the ticket
  • The Due date now show 4 hours late
My question is why does the Due Date continue to be shown (to both the Agent & Client) when the SLA was met?

Is there some rule/workflow I am missing here to reset the Due Date?

SLA Config: