Missing subtitle track from .mkv movie

Hello !
So i’m new here, i did read the “read before posting” but if i have miss any point, just yell at me and i will fix it ^^’ Oh and english is not my first language, so i might destroy some eye … sorry ^^

I’m running the last version available of Kodi on the android TV playstore. The hardware is a Nvidia shield TV and the media are store on a Freenas server and serve through CIFS.
I can’t tell if it’s new or not, but recently i’v started to watch movie with my family at lunch. Because i hate dub, we see them in VO with sub. Sadly they can’t deal with English sub, so i always download movie with both English and french subtitle already encode in the MKV (I’ve never deal with separate subtitle file, don’t know how it work). Sadly, on many of the movie, VLC see all subtitle track (French, forced french, and English) but kody only saw one, and usealy the forced french one witch doesn’t subtitle what people say. Right now i can’t find a movie where it work, but i know it use to on some movie i’v delete.

So, is that a common issue ? i didn’t find anything here or on google, but i might have missed it. could it be some encoding error on the movie ? Or is it about Kodi ?

Thank for any help you might bring !

Vlycop