It probably has a lifter bleeding down when it sits for a while. You could replace them or live with it. My dodge truck does that sometimes.
My 2010 used to do the same thing with the service stabiltrack occasionally when i first turn the key. It's common, we all have decided as long as it you don't see it again after the car is running then it's not an issue.
No dog in this fight anymore.
5th Gen owner 2009-2016.