CurrentCamera and PlayerGui is changing for all players?

I've recently noticed while making games that need things to change for a single player; it affects every player ingame. I'm not sure why this is happening since CurrentCamera and PlayerGui used to change for a single player. I'm not sure if I'm just scripting it differently, or if Roblox happened to send out an update that changed this.

A script I have here is meant to change only for a single player, and it changes text in the player's GUI. Instead of changing for a single player, it changes for every player.

p = game.Players.LocalPlayer
camera = workspace.CurrentCamera

playergui = game:GetService('Players').LocalPlayer:WaitForChild('PlayerGui')

local debounce = false

local text = "Test"
gui = playergui.Texter

workspace.Stop.Touched:Connect(function()
    if debounce == false then
debounce = true
    for i = 1,#text do
        gui.TextLabel.Text = string.sub(text, 1, i)
        gui.TextLabel.TextLabel.Text = string.sub(text, 1, i)
        wait()
    end
    wait(2)
    debounce = false
        gui.TextLabel.Text = ""
        gui.TextLabel.TextLabel.Text = ""
    end
end)

The script itself works fine, but whenever a player touches the Stop (a part in the workspace) the text "test" will appear on everyone's screen.

Another situation like this with CurrentCamera occurs. I have used CurrentCamera to change blur, color correction, and more.

This script snippet, which will supposedly change the player's screen to have a more green feel and darker tint works (with bugs), but displays these effects to every player's screen like stated with the PlayerGui problem.

camera = workspace.CurrentCamera

            camera.correct.TintColor = Color3.fromRGB(125,143,123)
            for i = 0, -.15, -.05 do
                camera.correct.Brightness = i
                wait()
            end
        end

With that being said, I hope that somebody can help me with this problem as it is a regular occurrence and annoyance. I appreciate any help that I can receive, have a good night/day. :)