SLA is Paused, Expired or Showing wrong timer on cases created when it was in inactive mode

So, we have created a SLA for our organization,

it was working well, but somehow it got inactive and then i reactivated it. But the cases created in between this are showing Paused, Expired or Showing wrong timer.

Any idea how we can fix SLA for this particular cases. It should be succeeded.

ex 1

ex 2

ex 3

it should be like this