I’m not sure if MNet and YG is able to keep up with English subbing on YouTube. Because of this you may see two different version of each video. The original aired version from MNet prior to any translated material. The English subs are secondary and used specifically for YouTube fans to watch. So suspect delays on English subs as the season progress. Each video will be indicated (KOR) Korean and (ENG) English. I don’t work for MNet or YG I just have good common sense.
Note: Although English subs are preset on some videos it can also be a scroll options menu separate from the video offer by YouTube. When you see a symbol that represents a ‘page’ that is English subs or use Google Chrome browser.