Server script not being cooperative and not printing player intvalue correctly? please help.

In a localscript i have a remote event that fires to the server, remote events automatically make the player the first parameter so the script on the servers side has the player. However, when i run these scripts below:

local lvlup = game:GetService("ReplicatedStorage"):WaitForChild("RE"):WaitForChild("lvlup")
local lvlupreturn = game:GetService("ReplicatedStorage"):WaitForChild("RE"):WaitForChild("lvlupreturn")

local player = game.Players.LocalPlayer
local leaderboard = player:WaitForChild("leaderboard")
local XP = leaderboard.XP
local Lvl = leaderboard.Lvl
local XPreq = Lvl.Value*100

local function set()
value.Text = XP.Value .. " / " .. XPreq
script.Parent.Size = UDim2.new(XP.Value/XPreq,0,1,0)
end

local player = game.Players.LocalPlayer
local leaderboard = player:WaitForChild("leaderboard")
local XP = leaderboard.XP

local debounce = true

local function levelup()
    if debounce == true then
        debounce = false
        lvlup:FireServer()
        end
        lvlupreturn.OnClientEvent:Connect(function()
        set()
        debounce = true
    end)
end

XP:GetPropertyChangedSignal("Value"):Connect(function()
    levelup()
end)

Server

local lvlup = game:GetService("ReplicatedStorage"):WaitForChild("RE"):WaitForChild("lvlup")
local lvlupreturn = game:GetService("ReplicatedStorage"):WaitForChild("RE"):WaitForChild("lvlupreturn")

lvlup.OnServerEvent:Connect(function(player)
local XP = player.leaderboard.XP
print(XP.Value)
lvlupreturn:FireClient(player)
end)

The server script always prints XP.Value as 0 even when it isnt