Things to try:
Add a new blank slide in the Cp project, you can set the action to the slide with audio troubles to Exit (the course) on Exit (of the slide). I didn't realize how redundant that was, until now!
Alternatively, you can add a blank slide to the PPT file, but I think adding it to Cp will work.
Did you leave some space after the audio clip and before? Try to avoid audio clips that start at the first frame of a slide and end at the last frame.
Is it a blank or a responsive project? How did you test?
Thank you BDuckWorks and Lilybiri for your replies. I did more research on Captivate 8 and apparently it is know that there are issues with importing ppt's.
The solution I went with was to copy my content from my ppt to Captivate's theme content builder, then I had to insert my audio from my first project that had the ppt's. t worked.
I won't be importing ppt's into Captivate anymore.