The function of adjusting the position of subtitles is particularly bad

If the subtitles are in srt format, the current function of adjusting the position of subtitles is quite good. However, the subtitles in ass format have location information. If the function of adjusting the position of subtitles is turned on, I can watch an episode with subtitles in srt format normally. But when watching a series with subtitles in ass format, I had to manually turn off this function. I think this function is strange. In other players, the position of srt subtitles is fixed in the screen or below the screen by default, and adjusting the setting of the subtitle position will not affect the position of the ass subtitles.