Download MPV from
https://sourceforge.net/
DO NOT PRESS THE GREEN BUTTON TO DOWNLOAD
EXTRACT WHEREVER YOU LIKE BUT THESE FILES CANNOT BE DELETED
Copy text from:
https://github.com/xzpyth/mpv-config/blob/main/mpv.conf
Name the text file mpv.conf which should be placed in the mpv folder. Make sure it becomes a .conf file or it will not work.
if you can't change the file extension you need to click on explorer ⮕ view ⮕ tick file name extensions.
Run your video in MPV and that should fix it
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Why does this happen!?
Because you downloaded a Dolby Vision HDR version of your movie, 4K movies generally come in Dolby Vision HDR which VLC can't handle properly yet. MPV is the only media player I could find that can handle Dolby Vision HDR with the help of a script.