After April 2014 AirVPN Major System Update I downloaded AirVPN Client v. 1.92 and generated new configurations for both Windows and Linux. However, when I am connected to AirVPN servers under Ubuntu 14.04 LTS Trusty Tahr 64-bit, ipleak.net reveals that Tor exit node is set along with AirVPN exit node, despite the fact that Tor application is not even installed. When Windows 8.1 Pro 64-bit is in use, Tor exit node doesn't exist. I checked the connection a few times with either Comodo Firewall turned on and off. My Comodo Firewall is configured to prevent leaks according to AirVPN articles.
In short, what does it mean? Does my connection (under Windows) lack some recently added additional layer of protection? If yes, how to turn it on. Have I to change Comodo Firewall configuration? If yes, tell me how, please.
Thank you for your responses.