So here is how you trigger it:
You have a sword, any sword, and you right click it (basically use the blocking thing). You do that for like half a second and then press the keybind for your sprinting, which my default would be L-CONTROL. When you do so, try a couple times until your FOV goes out like you're running, but you're standing still. You will then now be able to sprint in any direction, but when you jump, you don't go as far as you are running. Hope this is something to be fixed because it's weird.

Thanks for taking the time to read this. ^-