Duplicate subtitles from Youtube

[NarakuF]

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When I download subtitles form Youtube, e.g. running youtube-dl --write-auto-sub --skip-download --sub-lang en https://www.youtube.com/watch?v=bB3ZpRpVKWM, subtitles in both vtt and srt files are deplicate. Each sentence will repeat three times. Do we have a solution for this?

youtube-dl -v --write-auto-sub --skip-download --sub-lang en --sub-format ass/srt/best https://www.youtube.com/watch?v=bB3ZpRpVKWM
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '--write-auto-sub', '--skip-download', '--sub-lang', 'en', '--sub-format', 'ass/srt/best', 'https://www.youtube.com/watch?v=bB3ZpRpVKWM']
[debug] Encodings: locale cp1252, fs utf-8, out cp1252, pref cp1252
[debug] youtube-dl version 2018.03.26.1
[debug] Python version 3.6.4 (CPython) - Windows-7-6.1.7601-SP1
[debug] exe versions: ffmpeg N-90433-g5b31dd1c6b, ffprobe N-90433-g5b31dd1c6b
[debug] Proxy map: {}
[youtube] bB3ZpRpVKWM: Downloading webpage
[youtube] bB3ZpRpVKWM: Downloading video info webpage
[youtube] bB3ZpRpVKWM: Extracting video information
[youtube] bB3ZpRpVKWM: Looking for automatic captions
[debug] Default format spec: bestvideo+bestaudio/best
[info] Writing video subtitles to: How to Make a Peanut Butter and Jelly Sandwich-bB3ZpRpVKWM.en.vtt

[dstftw]

Duplication comes from Youtube. Nothing you can do.

[NarakuF]

@dstftw Hi, this happens to all the videos I download from Youtube. And When I download the subtitle manually or from some online downloading websites, the subtitle isn't duplicate. Could you double check it? Thanks.

[dstftw]

I've already pointed out what is the source of the problem.