Embarrassing Question about MIDI Echo

I can't believe I forgot this after all these years.
 
Normally—in the past—I would click on a track and that is that track that would play when I used a MIDI keyboard.
 
Somehow, I have gotten Preferences messed up so that every time I play a MIDI keyboard, I have to go turn off echo on other tracks and so they don't play along with the current track.
 
I have "Always Echo Current MIDI Track" on but other tracks play as well unless I manually turn them off.
 
What have I messed up?
 
Thanks.

Every once in a while it seems like I need to change a previous midi track's input from "omni" to "a random number that isn't omni" to prevent it from playing while a new track is created.