Players not spawning in correct place after respawning?

game:GetService("Players").PlayerAdded:Connect(function(plr)
    plr.CharacterAdded:Connect(function(char)
        char:FindFirstChild("HumanoidRootPart").CFrame = SpawnValues[math.random(1, #SpawnValues)]
    end)
end)

(SpawnValues is a table with the cframes of certain parts I want the player to spawn at) This script works fine in roblox studio, but in game it doesn't work? I don't want to use a spawnlocation part since I want the player when they join to spawn in the lobby, then later for them to spawn somewhere else.