Sometimes, a subtitle file is split into multiple parts, like Fury.German.srt.1 and Fury.German.srt.2 . Your video player only looks for a single file, so only the first "part" works, and you lose the subtitles halfway through.
Download the .srt file and rename it to match your movie file exactly (e.g., Fury.2014.mp4 and Fury.2014.en.forced.srt ). fury subtitles german parts work
If you are playing a digital backup or a physical disc rip, the media player might not know which subtitle track to prioritize. Sometimes, a subtitle file is split into multiple