I got the Safety Check and I most definitely wasn't using a VPN, nor was I in the same hemisphere. From an admittedly-unscientific sampling of my friends who a

I got the Safety Check and I most definitely wasn't using a VPN, nor was I in the same hemisphere. From an admittedly-unscientific sampling of my friends who also got the Safety Check alert, it seems like the geofence or query that led to alerts being pushed was misconfigured.