Main Output Signal is Faint on Right Side

I have M-Track Plus. The main right side signal out is very faint. I have tested the speakers and the sound cards on two computers, and they are all good. When I interface with the MTP as the sound card, the right signal is faint. It works fine when plugged into the headphones jack, but no matter the configuration/connection out of the main L or R or both, the right audio signal out is very faint. I have the latest driver. I just bought the unit. Any ideas? Thanks.
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