Why is the sound when speaking all Star Wars movies not playing properly?

I recently wanted to watch a few Star Wars movies on dvd, but then I noticed that the dialogues are not playing properly when talking about a character that is directly in the picture. You hear that they speak but very, very quiet and inaccurate, it nevt just extreme.

I never had any problems

I watch all my DvDs via the BluRay app on my XboxOne and actually every movie works except StarWars (Episode 1-8, Rogue One and even Solo)

On other devices, but it goes without any problems, even on the XboxOne s of my brother every movie works.

If someone can help, please answer

Are the original DvD's / BluRays? I have never had such experiences with the official ones.

Is the set channel number the same as your speakers? Surround sound on stereo speakers must not be, because you have to change this.