I'm having such a hard time trying to troubleshoot this issue.
I created and exported a clip that I intend to use as the intro for many other videos. When previewing in the Premiere Pro it sounds fine, when watching the exported clip it sounds fine, but when I drag that clip into a new project, there are clicking sounds on the track when listening in the project and upon the new video exported as well.
I have tried re-exporting that clip to see if that fixed it, but it didn't. I just don't understand why it is doing that. I also made sure I had the most recent version of the software and that my drivers were up to date.