Subtitles - strange facts

Hello,
First, I would like to say congrats! Serviio is the only one hwo can show subtitles on my Non SUpporting subtitle on DLNA TV. I have a Telefunken. Now, I would like to buy Serviio for my Synology NAS DS 115j. But I have problems with subtitles. So I have enabled subtitles. Let's say it is first time use of Serviio after a restart of server. I play movie X with subtitle X. It's working well. I try to play movie Y with subtitle Y but Serviio shows the subtitle for movie X. I don't know why.
I have enabled even "enable extraction of text-based subtitle embedded in video files" - not working. I even renamed the subtitle with Y_rum.srt (rum-romania). Nothing. Still subtitle of X movie. The "Enable burned-in subtitle" doesn't work for me, my NAS it's not that powerfull. And.. I can't even watch the intro
.
Anyway, does anyone have an ideea of what is the problem with the subtitle? Why if I play any movie the subtitle it's always of X movie?
I changed even the location of temp, in order to delete the files/log or something... But the temp folder is empty. I am new in NAS Synology and DLNA.
Thank you
First, I would like to say congrats! Serviio is the only one hwo can show subtitles on my Non SUpporting subtitle on DLNA TV. I have a Telefunken. Now, I would like to buy Serviio for my Synology NAS DS 115j. But I have problems with subtitles. So I have enabled subtitles. Let's say it is first time use of Serviio after a restart of server. I play movie X with subtitle X. It's working well. I try to play movie Y with subtitle Y but Serviio shows the subtitle for movie X. I don't know why.
I have enabled even "enable extraction of text-based subtitle embedded in video files" - not working. I even renamed the subtitle with Y_rum.srt (rum-romania). Nothing. Still subtitle of X movie. The "Enable burned-in subtitle" doesn't work for me, my NAS it's not that powerfull. And.. I can't even watch the intro

Anyway, does anyone have an ideea of what is the problem with the subtitle? Why if I play any movie the subtitle it's always of X movie?
I changed even the location of temp, in order to delete the files/log or something... But the temp folder is empty. I am new in NAS Synology and DLNA.
Thank you