Can anyone using ProtonVPN check Amazon's auto-detected location please?

Ashburn VA is one of the major data center hubs in the US, to the extent that if you live in the Eastern US there’s a pretty sizeable chance that any given internet connection you establish will go through Ashburn in one way or another. If you truly live nowhere near VA outside of being in the same time zone, it is almost certainly the VPN servers you are connecting to are located there.