My theory on the battery and SOC calculation is that regularly, the system has to recalibrate.
You know how a ferry boat deck hand might use a clicker to count passengers off, passengers on, or how an airline scans tickets to know their seat count.
But occasionally those numbers go askew and a manual headcount is necessary.
Our batteries are similar. Instant SOC is produced by measuring current in / current out (Coulomb counting), but that's not infallible. Other methods can't be used while the car is in use. Once the car is parked and the temp stabilizes, that's potentially one chance to reset.
I wouldn't sweat it too much. And yeah, there could be other explanations, I'm just supposing. But it's hard to imagine there's that much "vampire" draw without something big using it.
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