MM12 Firewire only plays left channel

I have a Multimix 12 Firewire that only outputs one channel When using as a mixer. If I press the PFL/SOLO button on the input channel it will play out of both speakers, and it does play in stereo. I have not tried to see if it is outputting to my DAW (Reaper) yet. It has been so long since I have used any of this stuff that I have to reeducate myself on it.

I have tried swapping the cables on both the input and output, but still only get the left channel.
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