Wow... somebody needs to calm down.
If you changed your depth chart to the lineup that played two games ago, then it's pretty obvious that you didn't save your new lineup before your NT game. I'm not exactly sure why you made that weird change to your lineup in the conference tourney, maybe you had a guy injured or something, but whatever happened, you didn't get your changes in for the next one.
Could have happened for multiple reasons - maybe there was an error when it saved the depth chart and you just overlooked it (had the same guy starting in two places or something along those lines). Maybe you tried to make your change too close to the time the engine simulated the game so it couldn't take effect. Maybe you just didn't hit the save button, which has burned us all before. The game isn't going to overlook your recent saved changes and go back to apply your lineup from two games ago though - so something obviously didn't save. You can type all the capital letters you want and submit all the tickets to CS that you want - but this one most likely came down to user error, sorry.