LinearVelocity not going Straight

Help and Feedback Scripting Support
#1

Why does my LinearVelocity never go direction were the player is facing? Sometimes it’s offset a little bit sometimes it’s on track depending on were i’m looking on the map.

local plr = game:GetService("Players").LocalPlayer
local char = plr.Character or plr.CharacterAdded:Wait()
local humrp = char.HumanoidRootPart

local UIS = game:GetService("UserInputService")
local RunService = game:GetService("RunService")

local debounce = false

local connect

local function ChangeBoost(direction, amount)
	local Direction = direction
	
	local currentspeed = char.Humanoid.WalkSpeed
	
	char.Humanoid.WalkSpeed = char.Humanoid.WalkSpeed - currentspeed
	
	local lv = Instance.new("LinearVelocity")
	lv.VelocityConstraintMode = Enum.VelocityConstraintMode.Vector
	lv.Attachment0 = humrp.RootAttachment
	lv.ForceLimitsEnabled = true
	lv.ForceLimitMode = Enum.ForceLimitMode.PerAxis
	lv.MaxAxesForce = Vector3.new(1,0,1) * 10000
	lv.VectorVelocity = Direction * amount
	lv.RelativeTo = Enum.ActuatorRelativeTo.World
	lv.Parent = humrp.RootAttachment

	connect = RunService.Heartbeat:Connect(function()
		lv.VectorVelocity = Direction * amount
	end)

	task.delay(0.5, function()
		char.Humanoid.WalkSpeed = currentspeed
		lv:Destroy()
		connect:Disconnect()
	end)
end

UIS.InputBegan:Connect(function(input, gpe)
	if gpe then return end
	
	if input.KeyCode == Enum.KeyCode.Q and debounce == false then
		
		ChangeBoost(humrp.CFrame.LookVector, 100)
		
	end
end)