HEVC/4K playback washed out colors ??

So I have a couple of HEVC/4K movies in my plex library, when I play any of the movies on my iMac via PMP the colors look normal as it should, vibrant colors, but when I play it on my appletv PMP colors are washed out, I tried it on a roku, PS4 and iPad Pro PMP and they all washed out. The only device beside my iMac that plays the 4K movies with correct colors its a vizio 4K tv with the built in PMP. Is this a bug ? Transcoding issue ? I will post a picture of this issue.