Framerate issues when playing content on Apple TV 4K

For some reason I am getting low frame rate issues when playing content on my new Apple TV 4K. For example, when I watch shows/movies on the Apple TV app, the frame rate is visibly lower than when I watch content through my normal smart TV apps, or my Fire stick.

I’ve tried enabling match frame rate and dynamic range, changing the video format, etc, but nothing seems to be working for some reason. Does anyone know what the issue could be and how to resolve it? I will have to send my Apple TV back if I cannot resolve this issue.