Plex Arcade Fire Stick 4K Doesn't Work

[XShocker22]

Plex Arcade and Fire TV

I have Plex arcade and Plex on my amazon fire tv the problem I have is that, when I try playing a game on Plex arcade, it only shows in the corner of my tv with the rest of the tv having what I can only describe as loading screen for the old systems like spectrum or commodore. Please help. It plays perfectly on my tv with server and on my phone, just not on my tv version? Any advice would be appreciated.