Incorrect audio selection on Firestick

[ca2ju]

Hi everyone, I'm experiencing an issue with the Jellyfin app on Firestick.
All of my media content (movies and TV shows) includes three audio tracks:

• English
  
• Latin Spanish
  
• Portuguese
  

But the audio track selection is not working correctly:

• Selecting English works fine.
  
• Selecting Spanish still plays English.
  
• Selecting Portuguese plays Spanish instead.
  

I’ve also tested playback using an external player (VLC), but in VLC, the audio has a noticeable lip-sync delay — the character moves their mouth and the voice comes out a bit later.
I’m trying to collect logs from the app to help diagnose the problem, but I’m not very experienced with debugging on Firestick. If anyone could guide me through what to collect or test to help resolve this, I’d really appreciate it.
System information:

• Device: Amazon Fire TV Stick 4k (2nd generation)
  
• App version: Fire OS 8.1.3.7 (RS8137/2904)
  
• Jellyfin server version: 10.10.7
  
• External player used: VLC (latest version)
  
• Audio codec used in the media: AAC HE-AAC
  
• Codec Video: H264 High