I have never had an issue with subtitles on Jellyfin, and my wife has turned our household into an always-on subtitles household. Are you making use of the Open Subtitles plugin?

Just gonna… Drop this here…

I adore OBS. I’ve been teaching my friends the basics on how to use it, as they’ve all been using some proprietary crap that makes their lives marginally easier in one or two areas but adds a huge headache in others.