How do I make this evaluator not print twice?

So I was having trouble with my evaluator and global variables, and since I didn't want to rewrite every variable, I added {__index = _G } after my setfenv my current code looks like this

    script.Parent.MouseButton1Click:Connect(function()

local eval = script.Parent.Parent.Input.Text
local output = ''


local environment = setmetatable({
-------------------------------------------
hs = game:GetService("HttpService"),
-------------------------------------------
  print = function(...)
    local args = {...}
    for i = 1, select('#', ...) do
      args[i] = tostring(args[i])
    end
   output = output .. table.concat(args, '\t')
  end
-------------------------------------------
},{__index = _G} )



local func, err = loadstring(eval)
if func then
setfenv(func, environment){__index = _G}
  local ok, ret = pcall(func)
  if ret ~= nil then
  output = tostring(ret) .. '\n'
end
else    
 output = err
end
script.Parent.Parent.Output.Text = output
end)

When doing something like printing Hello World!, it prints

Hello World!Hello World!

and I have no idea why. It did not do this before I added global variables, and I think It has something to do with me having the print function in my meta table, but I don't know.