I would suggest that based on your screen grabs that you only have a signal on input two, you have set the mono track to record from input one thus no signal.
In 1 doesn’t seem to be arriving, not even for that stereo track.
Try a little more troubleshooting…
Create a 2nd Mono input, routed from In 2. Does that work ok when you try to record a mono track? (or, on the contrary, do both inputs now disappear?)
Try swapping the physical inputs around. (to ascertain whether In 1 is actually being transmitted from your AudioBox).