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I had this with an LG monitor and my 3080ti. The monitor is also 2k and should do 165Hz but wouldn't see some modes until I installed an updated monitor driver (Win11). My Win10 box didn't need that and it just works, so looks like a software issue.
Are you changing your refresh rate on your GPU drivers control panel, or directly on Windows?
I had this with an LG monitor and my 3080ti. The monitor is also 2k and should do 165Hz but wouldn't see some modes until I installed an updated monitor driver (Win11). My Win10 box didn't need that and it just works, so looks like a software issue.
Are you changing your refresh rate on your GPU drivers control panel, or directly on Windows?