Prevent path stacking of video files is not working

Hello,

I am pretty new to kodi, so this might my a stupid q. I set up kodi on my Fire TV. Now, it stacked the movies “Back to the Future Part2” and “Back to the Future Part3” which clearly are independent movies. Well, I disabled the stacking in the video options, removed the movie from the library, but after the update, the movie is stacked again.

Does anybody have an idea for me ?