144HZ Fullscreen but 280HZ Borderless Windowed?

Monitor - Asus VG259QM. The game sets my monitor refresh rate to 144hz every time I go full screen 1920 x 1080 (280)* but if I set it to Borderless Windowed its fine but a bit laggy. Is there a way to fix this? In Game says 1920 x 1080 (280)* but my monitor is at 144hz but as soon as I switch to borderless or alt tab its back to 280hz.

= All drivers are up to date
= OSD and Display Settings say 280hz 1920x1080
= V-sync, G-sync, or Elmb isnt on in OSD or Display Settings
= Not running afterburner or any overlay

Please help…

What is your monitor’s native resolution? Is it set to 1920x1080p 280Hz on Desktop?

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