Do you see segments with duration -18, 20 and 32 seconds? This bug is occasionally encountered if broadcaster has a bad connection (some packets lost or corrupted).
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:6
#EXT-X-MEDIA-SEQUENCE:2462
#EXT-X-TWITCH-ELAPSED-SECS:4924.000
#EXT-X-TWITCH-TOTAL-SECS:4936.000
#EXT-X-PROGRAM-DATE-TIME:2018-08-23T18:49:19.208Z
#EXTINF:2.000,live
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#EXT-X-PROGRAM-DATE-TIME:2018-08-23T18:49:21.208Z
#EXTINF:2.000,live
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#EXT-X-PROGRAM-DATE-TIME:2018-08-23T18:49:23.208Z
#EXTINF:-18.000,live
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#EXT-X-PROGRAM-DATE-TIME:2018-08-23T18:49:05.208Z
#EXTINF:20.000,live
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#EXT-X-PROGRAM-DATE-TIME:2018-08-23T18:49:25.208Z
#EXTINF:4.000,live
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#EXT-X-PROGRAM-DATE-TIME:2018-08-23T18:49:29.208Z
#EXTINF:2.000,live
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#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:6
#EXT-X-MEDIA-SEQUENCE:7876
#EXT-X-TWITCH-ELAPSED-SECS:15722.000
#EXT-X-TWITCH-TOTAL-SECS:15758.958
#EXT-X-PROGRAM-DATE-TIME:2018-08-24T12:32:31.013Z
#EXTINF:32.000,live
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#EXT-X-PROGRAM-DATE-TIME:2018-08-24T12:33:03.013Z
#EXTINF:2.000,live
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#EXT-X-PROGRAM-DATE-TIME:2018-08-24T12:33:05.013Z
#EXTINF:1.959,live
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#EXT-X-PROGRAM-DATE-TIME:2018-08-24T12:33:06.972Z
#EXTINF:0.999,live
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