Blue Icicle USB preamp -- Stereo input?

I'm a little confused. I just received a Blue Icicle mic preamp. I noticed when I select it as my input device, Garageband records in 2-channel stereo mode, even though I am using a condenser mic--which I know is mono. The Icicle features one XLR connection, which begs the question: why should it detect the Icicle as a stereo source? Am I missing something here? Thanks for any input.