Wrong slide's audio playing during quiz with advanced answer options

Hi,

Using Captivate 11.5.1.499.

In my project, I have three quiz questions, all using the advanced answer option, so that I can go to slides explaining why a given answer was right or wrong. I'm also using my own navigation buttons. The layout is like this:

Slide 12 - Question 2 (multiple choice)

• If the right option is selected, jump to slide 13
• If one wrong answer is selected, jump to slide 14
• If the other wrong answer is selected, jump to slide 15

Slide 13 - Q2 right. After the explanation, a button appears. When clicked, it jumps to Slide 16, which is the next question.

Slide 14 - Q2 wrong 1. After the explanation, a button appears. When clicked, it jumps back to Slide 12, so the learner can try again.

Slide 15 - Q2 wrong 2. After the explanation, a button appears. When clicked, it jumps back to Slide 12, so the learner can try again.

Slide 16 - Question 3

and so on...

On the second question, a weird thing happens when previewing or publishing (HTML5). Using the example above, when I select the correct answer, it correctly jumps to Slide 13, the explanation runs with Slide 13's correct audio, and then the nav button appears. It pauses as it should, but it starts playing the audio attached to Slide 14, even though I haven't left Slide 13. 

If I select the first wrong answer, it correctly jumps to Slide 14, the explanation runs with Slide 14's correct audio, and then the nav button appears. It pauses as it should, but it starts playing the audio attached to Slide 14, even though I haven't left Slide 13. 

If I select the second wrong answer, it correctly jumps to Slide 15, but this issue does NOT occur. (maybe because the next slide has no audio?)

When clicking the nav buttons on any of these slides, they do jump to the correct slides.

I have the same setup for questions 1 and 3, but this issue does NOT occur there. I've checked the question settings and slide settings, and everything is the same. Does anyone have any advice?

Thanks in advance, Mike