Voting count gui script and display isn't working?

There are two errors. At line 2 of the 2nd script, you should change the value of every Player's gui, and not in the Starter gui. To do that, we need to get the player. How? Like this:

game.ReplicatedStorage.Vote.OnServerEvent:Connect(function(player)
        for i, v in pairs (game.Players:GetChildren()) do
                v.PlayerGui.Votes.Value.Value = v.PlayerGui.Votes.Value.Value +1
        end
        game.ReplicatedStorage.Vote1:FireAllClients()
end)

Also, you have to change the GUI text of every players. So I added a :FireAllClients() instead of :FireClient().

If you really just wanna use :FireClient(), you have to include the player between the brackets. Like this

FireClient(player)

Also, in the local script, you made a variable at line 3 that gets the value. The problem is that the Value never changes, because you just get it once. Instead, put line 3 inside the function OnServerEvent so it upgrades every time. Make sure to also put line 1 into the function, because line 3 uses line 1's variable, so line 1's variable needs to also change.

Hope this helped!