'Concatenated audio clips come out broken

I am concatenating a couple of audio clips using moviepy, but every 1/2 times or so, in the place where the files unite, there is a hiss sound or other extra sounds. How can I fix this? Code:

clips = []
for x in os.listdir(r"{}".format(cwd) + "/SpeechFolder"):
    clips.append(AudioFileClip(r"{}".format(cwd) + "/SpeechFolder/" + x))
    
speech = concatenate_audioclips(clips)```

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'Concatenated audio clips come out broken

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