@TeamYouTube also i have captions off but when i watch 三浦大知 (Daichi Miura) / Blizzard (映画『ドラゴンボール超 ブロリー』主題歌) title of the video it has caption subtitles on and yes i have the caption box in playback and performances unchecked
Mind trying these steps instead: At the bottom of the video screen, click the Settings icon > Subtitles/CC> Off. This should turn off the captions on a specific video. More about that here: https://yt.be/help/BfJw