Stereo Inputs with different Gain levels?

Hi,
I ran into a Problem a few days ago. I had a Nord Piano plugged into my SQ-6 for a live gig. I changed the two inputs to one stereo input.
The problem was that the right channel was way louder than the left one. After a bit of searching I’ve discovered that the gain on the two inputs wasn’t the same. Shouldn’t the two channels have a matched gain level when I change them into one stereo channel?
Thanks for your help
Jonas

Had the same thing some time ago. I describedit in this thread:
https://community.allen-heath.com/forums/topic/odd-behavior-on-stereo-inputs#post-91802

I also wrote there how to get rid of this situation.