Express 24/48 channel fader problem

My company owns a 24/48 that is giving me a very odd issue.

Channel 1 does not show any level change when I move fader 1. The channel 8 fader changes level for both channel 8 AND channel 1.

The bump buttons work with the correct channels like they should and the patch is set 1 to 1. 

Any ideas how to fix this? Is it a setting issue or a software issue?

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