Game stops functioning after more than one person in the server

Help and Feedback Scripting Support
#1

I made a script that is supposed to teleport everyone to the game area and organize players into teams once the intermission is over. Once the little game timer is over, it’s supposed to teleport everyone back to the lobby. When everyone is in the lobby, it’s supposed to place all the players in the neutral team.

It works well when I’m the only one playing, and there are no errors. However, once I bring my alt in the game, it won’t teleport people to the game area (it only teleports everyone to the lobby even if they’re already there) and the team placement is all skewed. Here is the script:

local roundLength = 5
local intermissionLength = 5
local InRound = game.ReplicatedStorage.InRound
local lobbyspawn = game.Workspace.LobbyAreaSpawn
local gamespawn = game.Workspace.GameAreaSpawn
local status = game.ReplicatedStorage.Status

local music = game.Workspace.music
local music1 = game.Workspace.music_duplex

local title = game.StarterGui.Menu.TitleScreen

InRound.Changed:Connect(function()
if InRound.Value == true then	
	local death = game.Teams.Death -- this sets the teams
	local runners = game.Teams.Runners
	local plrs = game.Players
	local runners = {}
	local chosen = plrs:GetChildren()[math.random(1, #plrs:GetChildren())]
	for i, plr in pairs(plrs:GetChildren()) do 
		if plr ~= chosen then
			table.insert(runners, plr)
			plr.Team = runners
		else
			plr.Team = death
		end
	 end	

	for _, player in pairs(game.Players:GetChildren()) do -- this teleports the players
		local char = player.Character
		char.HumanoidRootPart.CFrame = gamespawn.CFrame
	end
else --if the round isn't going, this places everyone in the neutral team and teleports them to the lobby
	local plrs = game.Players
	local Neutral = game.Teams.Neutral
	for i, plr in pairs(plrs:GetChildren()) do
		plr.Team = Neutral
	end

	for _, player in pairs(game.Players:GetChildren()) do
		local char = player.Character
		char.HumanoidRootPart.CFrame = lobbyspawn.CFrame
	end		
end
end)

local function RoundTimer() --this is the timer for the rounds. It changes the text in a GUI as well
while wait() do
	music:Play()
	music1:Stop()
	for i = intermissionLength, 0, -1 do
		InRound.Value = false
		wait(1)
		status.Value = "Intermission: ".. i .." seconds left!"
	end
	music:Stop()
	music1:Play()
	for i = roundLength, 0, -1 do
		InRound.Value = true
		wait(1)
		status.Value = "Game: ".. i .." seconds left!"
	end
end
end

spawn(RoundTimer)

My goal is to have all the players be organized into teams and teleported once the game starts unless they joined during the game. Once the game is done, they are all placed in the neutral team and teleported back to the lobby. Any help would be great!