I've had panels for 30+ years.......starting with MG-1s. At one point I was forced to use them in a VERY small room.....almost a cube, really. about 10x10x8. it was a hard, awful but fortunately temporary space.
when installed 'normally' there was an awful 'image' in the upper left corner of the room.....from where I sat. Really weird. Since I used dual banana plugs with color coding, my relative phase was good.
I swapped 'em left / right and problem solved. Never revisited so I never figured it out. Nasty small room.
BWP, please give it a try. It's free and easy......and if there is a change to YOU, it may be for the better, as it was for me.