Wav files being played back slow and deeper pitched

Our lab is creating an experiment that plays back a series of audio clips from songs. The clips are converted to mp3 from YouTube and then clipped at 48k, 20 seconds in length in audacity. The file is exported as a wav. In our testing certain clips are played back slow and deeper in pitch. The script still cuts it off after playing for 20 seconds regardless. We can not find any common factor between the clips that are slowed other than that it would be all of the clips for a given participant that are slowed. We are currently using ptb. There are no error messages. Any help would be appreciated.
OS (e.g. MacOs Ventura 13.3.1):
PsychoPy version (e.g. 1.84.x)