Choppy looking but I am getting 240fps

When I play Minecraft I get 240fps stable with shaders, yet my game still looks barely above 60fps. I have a 240hz monitor, I have the 240hz options in settings turned on in the resolution setting, and using lunar client I can see my fps and it doesn’t dip below 240 but my game just looks pretty choppy. I can’t find any fix and it just doesn’t seem to be displaying the frame rate that it says. Any ideas or similar problems?

EDIT: Solved it!! I was playing using lunar client which changes the settings menu and you can’t change the resolution and hz, so I had to download the vanilla 1.21 and change it from 1920x1080 60hz to 1920x1080 240hz.