Data saving combines stats?

I am using a data saving script and for the most part it works. What I am trying to do is save a players rebirths and strength. But when I rejoin the rebirth value is the same as the strength value (ex I have 50 strength 2 rebirths when I rejoin I have 50 strength 50 rebirths). Please help, here is the (server)script. Also btw this code is part of one big script that happens when the player joins the game.

    local strengthData, rebirthsData

    local success,errormessage = pcall(function()
        strengthData = DataStore:GetAsync("strength-"..player.UserId)
        rebirthsData = DataStore:GetAsync("rebirths-"..player.UserId)
    end)

    if success then
        if strengthData then
            strength.Value = strengthData
        end
        if rebirthsData then
            rebirths.Value = rebirthsData
        end
    end
end)


game.Players.PlayerRemoving:Connect(function(player)
    local success, errormessage = pcall(function()
        DataStore:SetAsync("strength-"..player.UserId,player.leaderstats.Strength.Value)
        DataStore:SetAsync("rebirths-"..player.UserId,player.leaderstats.Strength.Value)
    end)
end)