This is because the audio output mapping isn't identical in both sequences. This is very confusing and always has been. You can render audio waveforms to have them appear, but this takes time and disk space, and if you make an audio change in your nested sequence you'll have to render new waveforms. To avoid this, when working on multi-camera projects, I've always imported my cameras as dual mono tracks instead of stereo, setup my timeline with mono tracks, then have a stereo output track.
Since you're only showing a partial screenshot it's hard to say, but I would guess that you either have a mono track that you're dropping a stereo track into or A1 is Adaptive and you put a mono clip in first.
The way I set these projects up are to:
1) Import my camera footage with mono audio tracks (this option can be done from the preferences for a default, or you can right-click each clip and change the audio mapping
2) Create a sequence for my multi-camera setup using mono, not Adaptive tracks.
3) Create my editing sequence which the multi-clip will drop into to be edited. This will also have mono tracks.
4) The magic setting here is how you handle your audio in your multi-camera sequence. Camera 1's audio can be on A1 and Camera 2's audio can be on A2. In the Audio Track Mixer pan A1 to -100 and A2 to +100. This means you will hear different audio coming out of each speaker, but only in this source multi-camera sequence.
5) Bring your multi-clip sequence into your new sequence where you will edit and make sure NOT to change the sequence to match the settings.
If all this is done correctly then you should have waveforms pass through. This applies to the specific workflow I mentioned above, and there are lots of other details that might be specific to your project (for example, maybe you really need stereo source tracks, but with microphone audio that's unlikely). The main idea is that the audio you're passing through must perfectly match the tracks the nested sequence is applied to.
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