How come the quests don't go in the menu correctly?

So, I'm making a game called Samurai Simulator and I'm trying to make a quest menu. This is my code:

local function onMouseClick(player)
    local questnum = player:WaitForChild("Quests"):WaitForChild("questnumber")
    print(questnum.Value)
	if questnum.Value == 0 then
		local Quest1 = game.ReplicatedStorage.Quest1
		print("click1")
		Quest1:FireClient(player)
	elseif questnum.Value == 1 then
		local Quest2 = game.ReplicatedStorage.Quest2
		print("click2")
		Quest2:FireClient(player)
	end
end
script.Parent.ClickDetector.MouseClick:connect(onMouseClick)

There is a folder in Players called Quests and a IntValue called questnumber inside. Quest1 and Quest2 are both events in Replicated Storage and those events open up GUI tabs for both Quest1 and Quest2. Even when the value of questnumber changes, the script still thinks that the value is 0 and Quest2 does not work. Could anyone help? Thanks!

I believe the server doesn't act as if the second quest is the current one since to it, it isn't. One of the two cases are possible in your script's logic as of now:

1. You didn't change questnum's value at all, neither on the server nor on the client.
2. You change questnum's value on the client, hence the server observes no change.

Here's the fixed script that adds 1 to questnum's value, you might want to put the line:

questnum.Value = questnum.Value + 1

in the if-then itself since as of now, the script will advance to quest 3 which you don't have a case for

local function onMouseClick(player)
    local questnum = player:WaitForChild("Quests"):WaitForChild("questnumber")
    print(questnum.Value)
	if questnum.Value == 0 then
		local Quest1 = game.ReplicatedStorage.Quest1
		print("click1")
		Quest1:FireClient(player)		
	elseif questnum.Value == 1 then
		local Quest2 = game.ReplicatedStorage.Quest2
		print("click2")
		Quest2:FireClient(player)
	end
	questnum.Value = questnum.Value + 1
end
script.Parent.ClickDetector.MouseClick:Connect(onMouseClick)

On another note, here are some recommendations:

• A way to shorten your if-thens even further:

local function onMouseClick(player)
    local questnum = player:WaitForChild("Quests"):WaitForChild("questnumber")
    print(questnum.Value)
	local remote = game.ReplicatedStorage:FindFirstChild("Quest"..questnum.Value)
	remote:FireClient(player)
	questnum.Value = questnum.Value + 1
end
script.Parent.ClickDetector.MouseClick:Connect(onMouseClick)

• Using a single remote for all quests since it can be extensive manual work to make a remote for each quest:

local remote = game.ReplicatedStorage:FindFirstChild("Quests")
local function onMouseClick(player)
    local questnum = player:WaitForChild("Quests"):WaitForChild("questnumber")	
	remote:FireClient(player, questnum.Value + 1) -- Also provides a parameter for the quest being started or being attempted to start
	questnum.Value = questnum.Value + 1
end
script.Parent.ClickDetector.MouseClick:Connect(onMouseClick)

• Using :Connect() instead of :connect(), :connect() is deprecated and should not be used.

That's it from me! Be sure to comment if you have any questions or I have made a mistake!