Having issues with history sets involving DVEs.

I have history sets on a monitored table.

When I enable the DVE, the alarm moves to the new element successfully and keeps the history set. (The 'warning' alarm in this example)

After I disable the DVE, the alarm is recreated under the parent element with a new root alarm time.

Is this expected behavior or is there something I missed out in my implementation? Appreciate any advice, thanks!