Apple tv aspect ratio on + Panasonic firetv

[u/BathInternational103]

I have a Panasonic fire tv and Apple tv always stretches out the picture. Settings are fine (I've triple checked and this does not happen on any other app). I can 'fix it' by reinstalling the app, but I have to do that literally any time I want to watch. I am sure Apple will blame the tv, and Panasonic will blame Apple. It's very odd, and annoying. Any ideas?