Wrong audio channel used

I have two fire TV. The issue occurs on both an only those. Plex on smart TV, Web or PC app do not have the issue.
I have a tv show with multiple audio channels. I have configured plex to use the French channel by default.
The firsts channels on this show are
English (DTS HD MA 5.1)
English (DTS 5.1)
Spanish (AC3 Stereo)
French (DTS Stereo)
German (DTS Stereo)
Plex says it uses the french channel but the audio is in german. To have the french audio I have to use the spanish channel. When using any other client, the french channel has french audio.
It’s very annoying since it falls back to the default at the end of the episode and I have to switch back to spanish to get the french. Setting spanish by default is not a solution as other shows don’t have this issue.

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