SetAsync isn't saving [Added More Scripts]?

For some reason this doesn't save.

Leaderboard Script :

local data = game:GetService('DataStoreService')

local buxData = data:GetDataStore('Mini-BUX')
local winsData = data:GetDataStore('Wins')

game.Players.PlayerAdded:connect(function(player)
	-- Stats
    local leaderstats = Instance.new('Model')
    leaderstats.Name = 'leaderstats'
    leaderstats.Parent = player
 
	wins = Instance.new('IntValue')
    wins.Name = 'Wins'
    wins.Value = 0
    wins.Parent = leaderstats
	
	credits = Instance.new('IntValue') 
	credits.Name = 'Mini-BUX'
	credits.Value = 0
	credits.Parent = leaderstats
	
	-- Get Stats 
	local buxStats = buxData:GetAsync('User_'..player.UserId) or 0
	local winsStats = winsData:GetAsync('User_'..player.UserId) or 0
	print('Loaded '.. tostring(player.Name).. "'s" .. ' Stats')
end)

game.Players.PlayerRemoving:connect(function(player)
	winsData:SetAsync('User_'..player.UserId .. ':Wins', wins.Value)
	buxData:SetAsync('User_'..player.UserId .. ':Mini-BUX', credits.Value)
end)

MainScript :

-- Changes Stats
				player.leaderstats['Mini-BUX'].Value = player.leaderstats['Mini-BUX'].Value + 100
				buxData:SetAsync('User_' ..player.UserId .. ':Mini-BUX', player.leaderstats['Mini-BUX'].Value)
				
				player.leaderstats.Wins.Value = player.leaderstats.Wins.Value + 1
				winsData:SetAsync('User_'..player.UserId .. ':Wins', player.leaderstats.Wins.Value)