Hey! I think I understand what you’re trying to ask - but correct me if I’m wrong.
You have the Main Outs from the AR going to (for ex.) Channel 1 + 2 in your mixer, and using the BD and SD outputs to go to (for ex.) Channel 3 + 4? In this scenario, as long as 3 + 4 aren’t panned, they should come out of your mixer in the centre of the stereo field. Also, is it necessary to pan hard left and right? Most mixers account for stereo inputs and do not sum the two channels together.
Another interpretation could be that you are only using the Main Outs from the AR and going into your mixer (i.e. no individual BD or SD outputs are being used). In this scenario, your stereo field will be widened through panning, but your BD and SD should not come out on the L or R side on their own.
Does this make sense? If you’re still unsure, or can’t tell where the signals are going, it might help to Solo the voices in question, and see where they turn up in your DAW.
I hope this helps!