Mixed Audio Tracks: How'd it happen?

I'm a relative newbie. FCP 5.02 using Built in Audio.
I have a Beta Source Tape with split tracks (a lav on each track of a two person interview).
I captured it in DV 48Khz, source remained split.
I edited some pulls into a sequence.
For reasons I hope someone can explain, the sequence rendered my audio as mono out, mixing the two tracks so that they are no longer individual as sources (though a match frame takes one back to the original which is.)
How do I get back to the unmixed version and what setting is driving this process when I am just using two tracks?
When I look at the tracks of the sequence in the Mix Tool, they appear to be panned completely right and left just as the source is and not panned to the center (as one might think they would appear now that the split tracks are mixed together.)
Any tips would be appreciated.

I tried changing that setting but it appears to have no effect on the output. I'm not clear if in any configuration it should lead to a mixed output. My understanding is essentially one is a unmixed multi channel output 1 to 1, 2 to 2, 3 to 3 and the other is a traditional stereo mix, 1 to left, 2 to right, 3 to left, and so on.
Imagine two mono sources like two separate Lavs, A on track 1 of the source and B on track 2. If the sequence is set to multichannel, then A should always remain on Track 1 and B on track 2. They wouldn't output mixed. If the sequence is set as stereo, then track 1 is panned left and track 2 is panned right and they shouldn't end up mixed.
I wonder if there is a scenario where one goes from multichannel to stereo, and FCP assumes everything should be center. Then I would think that would be reflected in the audio mix tool but it isn't.
Last but not least, perhaps there is some way to unwittingly achieve a mix of A and B by editing a sequence into sequence, which is a methodology I use often.
Another stray bit - in the options for built-in audio there isn't a 48Khz setting, just 44.1 Khz. Since the sequence is DV and at 48 Khz, does that force a render?

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