Wrong aspect ratio Stremio + RD (TCL C6K)

I have a TCL C6K

I've noticed that some files (don't know why) doesn't respect the original aspect ratio. Instead, the TV shows it in Full screen/Zoom/Fill. Tested today with Dunkirk (2017) for example. On the TV: Full screen 16:9, on the computer: original aspect ratio 2.20:1.

Tried changing the image size mode on the player; tried VLC, MPC, Just Player. Tried changing some TV settings, and the problem continues.

I know that the problem is probably on the TV, just want to know if someone might had the same experience.

Sorry for the english.