Audio bleed with SX2

I've noticed that when I have faders all the way down on both channels, and am playing a track (for instance, to cue it), you can still faintly hear audio through the main output. This can also be heard both through the cue headphones. This behavior goes away as soon as one of the faders is put up.

Eg. If I am cuing a track on deck 2 with neither fader up, you can hear the audio through the mains. If you then start playing a track on deck 1 and turn up the volume, you'll no longer hear the track on deck 2.

This makes it extremely difficult to tag with another DJ, since your audio is being sent to the mains while you are trying to beat match before turning up the volume. Any suggestions?