Hi Calvin
that's very strange/unlikely that an editor may cause such a problem. I'm confident about this.
At the moment there is no upload area, but it will added later on. Another possible way to collapse a multichannel preset to stereo is to modify a routing. Each output can "see" up to 2 sources…so the 2 stereo outputs can accept 4 channels. My advice about adding a mixer though offers more flexibility as you can have dedicated levels and panning to each channel.
all the best
I