Custom rig double jumping?

Any ideas as to why this is occurring?

It's kinda hard to tell but the character does a slight double jump before touching the ground.

I'd image it's related to the humanoid hip height but I've changed it many times now and the only time it stops doing it is when the character is too low with it's legs sticking through the floor.

EDIT: If anyone stumbles upon this with the same issue, I fixed it by making the HumanoidRootPart the length of the entire rig, originally it was only the size of the Torso but I extended it down to the feet

Try this.

local UserInputService = game:GetService("UserInputService")
local localPlayer = game.Players.LocalPlayer
local character
local humanoid
 
local canDoubleJump = false
local hasDoubleJumped = false
local oldPowerlocal TIME_BETWEEN_JUMPS = 0.1
local DOUBLE_JUMP_POWER_MULTIPLIER = 1.5

function onJumpRequest()
	if not character or not humanoid or not character:IsDescendantOf(workspace) or
	 humanoid:GetState() == Enum.HumanoidStateType.Dead then
		return
	end
 
	if canDoubleJump and not hasDoubleJumped then
		hasDoubleJumped = true
		humanoid.JumpPower = oldPower * DOUBLE_JUMP_POWER_MULTIPLIER		humanoid:ChangeState(Enum.HumanoidStateType.Jumping)
	end
end
 
local function characterAdded(newCharacter)
	character = newCharacter
	humanoid = newCharacter:WaitForChild("Humanoid")
	hasDoubleJumped = false
	canDoubleJump = false
	oldPower = humanoid.JumpPower 
	humanoid.StateChanged:connect(function(old, new)
		if new == Enum.HumanoidStateType.Landed then
			canDoubleJump = false
			hasDoubleJumped = false
			humanoid.JumpPower = oldPower		elseif new == Enum.HumanoidStateType.Freefall then
			wait(TIME_BETWEEN_JUMPS)			canDoubleJump = true
		end
	end)
end
 
if localPlayer.Character then
	characterAdded(localPlayer.Character)
end
 
localPlayer.CharacterAdded:connect(characterAdded)
UserInputService.JumpRequest:connect(onJumpRequest)