datastore isn't saving if value goes down??

local DataStore2 = require(1936396537)

DataStore2.Combine("MasterKey", "Yuan", "Kills")

game.Players.PlayerAdded:Connect(function(plr)
	
	local yuanData = DataStore2("Yuan", plr)
	local killsData = DataStore2("Kills", plr)
	
    local leaderstats = Instance.new("IntValue", plr)
    leaderstats.Name = "Stats"
 
    local yuan = Instance.new("IntValue", leaderstats)
    yuan.Name = "Yuan"
	local kills = Instance.new("IntValue", leaderstats)
    kills.Name = "Kills"
	if yuanData:Get() ~= nil then
    	yuan.Value = yuanData:Get()
	else
		yuan.Value = 0
	end
	if killsData:Get() ~= nil then
    	kills.Value = killsData:Get()
	else
		kills.Value = 100
	end
	
	yuan.Changed:connect(function()
		yuanData:Set(yuan.Value)
	end)
	kills.Changed:connect(function()
		killsData:Set(kills.Value)
	end)
end)

my datastore2 doesn't work if either of the values go down from what it is, only saves if it goes up??