If you're recording a mic, you are recording in mono. You can't record a stereo track out of a mono source. Or are you actually trying to record a stereo source? How do you have it connected to the Mobile?

How are you monitoring while recording? Are you trying to monitor through the Mobile, or through your computer's sound card?

It is possible that your usb device can only handle signals in one direction, depending in what sampling rates and resolution you're recording in. If you're trying to monitor through ths Mobile, this could be what is causing you not to hear what you already recorded.