Subitltes tremors/shaking on core 19 + 20 +21 unless 9.2.8

i have about 1000 movies from rarbg 1080p x256 (all movies have 2gb ± ) on a hdd i always on coreelec 9.2.8 becouse skin aura , now i update to nexus and certain movies the subs shakes , u can see on a video that i made, i have 3 boxes , t95z plus s905x3 + h96 max s905x4 and my old s905L on emmc, i try all versions 19, 20 , 21 on my 3 boxes subs always shakes, but on 9.2.8 its ALL ok, this is a problem of what? x265 codec? i try all refresh rates , 2 tvs try, new hdmi cables, re-download movie and try on another hdd, nothing helps
please help i dont wanna go back to 9.2.8

no one know what is this ?

Clean fresh install without restore a backup?

hey, this is what i already did :

  • fresh install on all my 3 boxes with coreelec 19, 20, and 21 in emmc and usb , with no addons installed, the bug remains
  • on vlc or kodi in windows movies is ALL OK
  • only in coreelec 9.2.8 ALL movies is OK

so this is a problem of a codec or simple a bug with x265 media files, you can try download in rarbg this movies for exemple that is infected with shaking subs

Jurassic.World.Fallen.Kingdom.2018.1080p.BluRay.x265-RARBG … and many more…

update status : i disable amlogic hardware acceleration, movie suffers a big delay of course but subtitles IS GOOD on coreelec 19, 20, 21