Find the audio clip in the Library, right click on it and look at Usage. You may find that it has become attached to some object on one of the slides in addition to the slide where you want it to play. If it hasn't, go through all the other clips in the Library to make sure there isn't another clip that is a copy of the audio and THAT clip has become attached to some object. If that doesn't help, then export the clip, change it's file name, delete the original clip in the project, and import the renamed clip.
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