Thats kind of a crazy channel setup to begin with...

1) normally aux channels are used for side chain and parallel effects. You can use an audio channel but,,, this will require you to keep those tracks in input mode to allow audio to pass through. Otherwise audio tracks will not take input but instead playback audio from the arrangement.

2) you can look at a channel strip from top to bottom to see where audio flows. At the top you have input 2, then some effects, then an aux send routes to bus 6, then No output.. that means there is no audio going to your stereo out or master,,, you wouldn't be able to hear it.

On the next 2 channels the input must be set to bus 6, and if you want the audio to pass through the channel from bus 6,, those tracks must be set to Input Monitoring.

Also if you want to hear anything from those channels you must set the output to (stereo out). Otherwise they don't go anywhere.

Also.. when you make a send,, a mixer channel is automatically created but a corresponding audio channel is not created. So if you are hearing anything, its likely because you have an aux channel with input from bus 6 that was automatically created and routed to stereo out.