Shaking on subtitles on coreelec 19, 20, 21

Good afternoon, I have a strange problem with subtitles, they shake in certain movies, i have more than 1000 movies x265 1080p rarbg, I have the box h96 max s905x4 and t95z plus s905x3 in emmc I tried it with corelec 19, 20, 21 and it always does the same, except in version 9.2.8 where Do not do that, you can see video from this user, that is same problem Weird shaking on subtitles - #3 by ukmark62

thanks