Why Does Feedback Not Appear?

Hi everyone - I am an infrequent Storyline 360 user.  I created a multiple choice quiz with only two answers.  I'd like to show feedback for why the Correct response is correct.

When I select Feedback by Question, I enter the feedback at the bottom (Set Feedback and Branching) - when I preview the slide, the box with Correct pops up, but my feedback is missing. However, the feedback for the Incorrect answer shows up, no matter what text I put in there.

What am I doing wrong?  I'd prefer the feedback to be part of the popup window, and I don't understand why it appears for the incorrect answer, but not the correct one.

Thanks,

Tom