As the titles says the boost key doesn't work for me in my server that I have, yes I have to bound to a key that isn't conflicting, and I am pressing it. I also turned off the setting to only boost the quantum leggings when sprinting. The thing is, when I set the boost when sprinting option to true the leggings work fine, but when I use the boost key to jump with the boots, I jump the normal height. Same thing happens when I set the sprinting option to false, it doesn't boost the legs when I press the key. I have no idea what is causing this issue. No error log because it doesn't crash.
Edit: Also it works just fine in SP.