second layer appears when Prev is clicked

I am having trouble with some buttons. I am posing a question for the learner and having them click an "Answer" button to learn more. The Answer is a separate layer with a "Back" button. When I published the course I found that if I advance from that screen, then click Prev, I see both layers. I tried putting a trigger in that said "change state of text box to hidden when user click Next" but it didn't even take. . . HELP! (The attached image isn't from the LMS, but it is what the screen looks like)

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