scripts breaking when not using solo?

so im experiencing a problem such that my scripts work perfectly fine while i test it in solo mode but as soon as i start server and play it most of the scripts do now work(some do though) this also occurs when my random people play the game do you know what the problem is?

Additional Info: Using local scripts Player can for some reason edit my textbox

local last = nil
local function turnOrange(new)
    if last ~= nil then
        if new.Name ~= last.Name then
            new.TextColor3 = Color3.new(227, 125, 0)
            last.TextColor3 = Color3.new(235, 235, 235)
        end
    else new.TextColor3 = Color3.new(235, 235, 235)
    end
    last = new
end 

for i, v in pairs(script.Parent.Parent:GetChildren()) do
    if v:IsA("TextButton") and v.Name ~= "Select" then
        v.MouseButton1Click:connect(function()
            turnOrange(v) 
        end)
    end
end



local last = nil
local function changeTransparency(new)
    if last ~= nil then
        if last.Name ~= new.Name then
            new.BackgroundTransparency = 0.5
            last.BackgroundTransparency = 1
        end
    else new.BackgroundTransparency = 1
    end
    last = new
end
for i, v in pairs(script.Parent.Parent:GetChildren()) do
    if v:IsA("TextButton") and v.Name ~= "Select" then
        v.MouseEnter:connect(function()
            changeTransparency(v)
        end)
    end
end