This is quite an interesting problem I'm having. I go to a local church and recently volunteered to mix their live band occasionally on Sunday mornings. They have a SoundCraft Vi6 console. Everything seemed to be fine, however all the output from the board was panned right in headphones. I was a little worried but they have the main outputs in mono for whatever strange reason, so I decided to ignore it for the day. I got home later that day and checked the mix online. I found that the recording was also strangely panned. Not only was it panned, but I thought I noticed some massive phase issues in the mix. I forced the mix to mono and sure enough, there was crazy audible comb filtering. I always thought the audio was strange in the hall for some reason I couldn't pinpoint.
I thought it could be some vocal microphone placement but they're a good 5-6 feet apart from each other, and they use in-ears 90% of the time. I am just absolutely baffled at this point. If anyone could offer any ideas or hints as to why we have this problem would be really appreciated. I can also provide an audio example if needed. Thank you.