This is the glycol cooling system. It runs anytime the DC-DC converter is enabled to charge the 12V battery, so this is anytime the contactors are closed. It's normal, and most cars do it a few times a day, usually for an hour are so. You'll hear the contactors go "Click Clunk" and then the pumps will kick on. When the charge cycle completes, the contactors will drop out with a soft "clunk" and the pumps will spool down. Anytime you wake up the car, the contactors close in anticipation for the drive, and if the 12v needs charging at that point, they will go ahead and stay closed until the charge completes, even if you shut the doors and walk away.
Hmm. I've heard the cooling pumps spin up every time the contactors close, but they usually spin down to idle if not needed for passive cooling. Also, simply waking the car from the mobile app will not close the contactors unless the 12 V has dropped below a trigger voltage.