30 FPS cap issue

So even though I have set 60fps in my game settings, ingame the game is capped at 30fps.
I’ve tried fullscreen, vsync, dropping the refresh rate in fullscreen from 144hz to 60hz.
What can I do to make this 30fps cap go away? There is an FPS slider in the game up to 300fps so I’m assuming it is not meant to be capped at 30. Thanks.