gui.MouseLeave won't fire when coming out the left side?

I made a weapons manager, and when you enter the weapon box you can scroll through weapons. When you leave, you are not allowed to do this. This works on all sides of the Frame, except for the left side. So is this a Roblox bug?

Code: (Focusing on the "Hand Selection")

--[[
    TITLE:          WEAPONS_MANAGER
    AUTHOR:         GEM_API
    CREATED:        6/11/18
--]]
--------------[ VARIABLES ]-------
local player = game:GetService("Players").LocalPlayer
local mouse = player:GetMouse()
local gui = player.PlayerGui:WaitForChild("WeaponSelectionGui")
local changing = false

local handWeapons = {"Unarmed", "Hands"}
local lightWeapons = {"Pistol", "Combat Pistol", "Silenced Pistol"}
local heavyWeapons = {"Assault Rifle", "Machine Gun"}
local specialWeapons = {"Rocket Launcher", "Railgun"}

local selectionHand = 1

local maxSelection
--------------[ FUNCTIONS ]------
function changeSelection(slot, text)
    slot.TextLabel.Text = text
end
--------------[ STARTUP ]---------
gui.Hand.MouseEnter:Connect(function()
    print(2)
    changing = true
end)
gui.Hand.MouseLeave:Connect(function()
    print(1)
    changing = false
end)

mouse.WheelForward:connect(function()
    if changing == true then
        maxSelection = #handWeapons
        if maxSelection > 1 then
            selectionHand = selectionHand+1
            if selectionHand > maxSelection then
                selectionHand = 1
            end
            changeSelection(gui.Hand, handWeapons[selectionHand])
        end
    end
end)
--------------[ LOOPS ]------------