What are the audio streams, truehd/atmos, or dts-hd-ma?
are they same for both movies?
do you have subtitles enabled for either movie? both? or none?
post the screenshots of the server status now playing for both movies, like how the jellyfish example is posted above.
you can also watch the bandwidth used by both to see the real time network use. The bitrates shown above are simply static averages, 4k/hdr remuxes can easily burst exceeding 100mbits (more than fast ethernet can handle).
You should also carefully read the whole thread @ Plex, 4k, transcoding, and you - aka the rules of 4k - a FAQ - General / General Discussions - Plex Forum
