Script in gui opening other players' guis?

I have this local script that when an Image Button is clicked, it opens a gui called "Frame". The frame is used for editing inventory stuff, which raises an immediate problem, trolling. I have no idea why the gui is opening another gui rather than itself.

The bug only happens when multiple people are in the server, and to the second player to open the inventory. If that player tries to use the gui, the script spits out a wad of errors and doesn't do anything. Any help?

This is what I think the bugged part of the script is

script.Parent.MouseButton1Click:Connect(function(clk)
    print("Clicked")
    local Plr = game.Players.LocalPlayer
    local Box1 = workspace.InvetoryBoxes.Invetory1
    local Box2 = workspace.InvetoryBoxes.Invetory2
    local Box3 = workspace.InvetoryBoxes.Invetory3
    local Box4 = workspace.InvetoryBoxes.Invetory4
    local Box5 = workspace.InvetoryBoxes.Invetory5
    workspace.CurrentCamera.CameraType = Enum.CameraType.Scriptable
    ----------------Check which boxes are occupied-----------------
    wait(0.01) ---security check---
    if workspace.InvetoryBoxes.Invetory1.InvetoryBox1.Occupied.Value == false then
        print("1 is free!")
        workspace.CurrentCamera.CFrame = CFrame.new(Box1.Camera1.Position)
        print("Camera is Ready!")
        ----------Change Value Non-Locally-----------
        local remote = game.ReplicatedStorage:WaitForChild("Occupy1")
        local valueToChange = workspace.InvetoryBoxes.Invetory1.InvetoryBox1.Occupied
        remote:FireServer(valueToChange)
        print("Fired!")
        Plr.PlayerGui.Inventory.Frame.Visible = true
        Plr.PlayerGui.Inventory.ImageButton.Visible = false

Any help?