Sorry, seem to repeat what I already told you about messing up Quiz slides. This problem is also due to that.
The actions On Success are executed after completing the two-step Submit process. The Submit button is essential. I explained some possible tweaks in this post:
Question Question Slides in Captivate - Captivate blog
You'll see how to skip one of the steps, how to attach audio to an object etc.
In an advanced action everything is always done very quickly, the action will not wait until the audio clip has played before jumping to another slide. Misunderstanding actions.