If that’s the case it could be that the voters don’t know how to operate the simple voting machine. Right before you push “cast ballot” there is a screen with everyone’s name you selected. If you see it’s wrong you can call someone over and they’ll show you how to back up.
Not necessarily. I don’t know how the software works, but at some point the vote is changed from Trump (or Cruz?) to Rubio. Does it happen before or after the screen displaying your vote? Could be either one.