Question Why can’t my monitor run 1920x1080 at 240hz

Jul 28, 2021
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I have the omen 27 inch 2560x1440p 144hz- 1920x1080 240hz monitor by hp, and when I try to run 1920x1080p on some games (for example fortnite) I cannot get it to run 1920x1080p on 240hz, i have to use 1600x900 which is more blurry. What do you think could be causing this?