Youtube-dl downloads WRONG AUTOGENERATED SUBTITLES

[sg2013test]

Hi,

youtube-dl version is 2018.09.18.

I am trying to download english autogenerated subtitles to the following video:
https://www.youtube.com/watch?v=f-wWBGo6a2w

I am GETTING WRONG AUTOGENERATED subtitles. Both the ttml and vtt subtitles that I am getting are wrong,

For example, if you watch given video online on youtube with autogenerated english subtitles turned on,
the first sentence will be "well thenk you all very much for comming"
but in the vtt and ttml files that I am getting the first line is "Thank you all for coming "

plus the vtt file that I am getting is truncated.

Please somebody help

I am attaching the autogenerated subtitles that I am getting for that video:

example.zip

and this is the code I am using:

import youtube_dl

at = '2018_'
video_name = 'ppppp'
youtube_url = 'https://www.youtube.com/watch?v=f-wWBGo6a2w'

ydl_opts2 = {
'skip_download': True,
'subtitleslangs': ['en'],
'subtitlesformat': 'ttml',
'writeautomaticsub': True,
"outtmpl" : r"{}_{}.%(ext)s".format(video_name, at),
}

with youtube_dl.YoutubeDL(ydl_opts2) as ydl:
ydl.download([youtube_url])