Your IPv4 and your IPv6 will be displayed.
When an address belongs to one of our servers, the text Arethusa will be displayed under the address, followed by the country code of the server.
If your IPv4 and IPv6 are both Arethusa addresses, then your Internet activity is going through the VPN.
It is a bad idea to rely solely on geolocation data to check if you are using a VPN.
Geolocation of IP addresses is not 100% reliable, especially when it comes to VPN servers. And most geolocation websites test only your IPv4 or your IPv6, but not both.