Of course! I should have asked for a screenshot of the timeline immediately, slapping my head.
You have a shape button 'SmarShape_101' (please label objects) that is pausing the slide at 1.5secs. I suspect it is a Next button, and may I give you a tip? Why do you use two objects: Text caption + shape instead of typing the text IN the shape? To solve the issue of your question: go into the Timing panel and set the Pause at about 30 secs (almost the end of your audio clip). Moreover there is no reason at all to make that slide so long. Once the audio clip is finished nothing will happen. Be also careful with attaching the timeline of SmartShape_101 and Text_Caption_WAW.... to the end of the slide timeline! If you extend the slide timeline, the whole timeline of those two objects will move to the right, endpoint is attached and duration will be kept. It is much better to use CTRL-E to extend timelines till the end of the slide. In that case extending the slide timeline will also extend the timelines of those two objects.