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Thanks for reaching out to us on this forum.
According to your discription, I suspect that you did not set the data level correctly when you export the file or your monitor was not set to full range. Please look at this KB artilce on how to export a Dolby Vision master:https://professionalsupport.dolby.com/s/article/How-to-Export-a-Dolby-Vision-Master-File?language=en_US
Let us know if you have further questions.
Best
Sylar