Hey !
Didn’t run into that kind of issues…
Do you hear any difference from your monitor left and right ?
What kind of effects do you use ? Any of those that could be hard panned to one side ?
Make sure you are sending Master Stereo as the KPA doesn’t automatically sum to mono so the wrong setting could affect sound which are stereo originally. As your sound engineer says left and right are “different “ I assume you are running stereo to FOH so this is unlikely to be the issue but check everything rather than assume.
Next , are you running a widener or doubler effect? They may sound different on both sides. The doubler for example has a built in level adjustment to compensate for the Haas effect.
You should check the MAIN OUT without any stereo effects. Make sure Panorama sits in the middle position.
If there is still a level difference between left and right XLRs, it must be hardware related.
