And every time I log in I get an email saying that my account has been logged into from an unknown device even though I've only been using one computer the entire time.

I always have to write out my email and password and do the 2-step authentication to sign in if I turn on the Launcher itself (though it does auto login if I start a game from Steam). However, for some reason this doesn't register as me playing the game because the offline mode doesn't work and tells me that I first need to run the game at least once online, but I've done that many times over. Anyone know what's going on and how to fix it? Much appreciated.