STDIN.read(1) and STDIN.getc reading in multiple characters

ui.rb

# encoding: utf-8

module G
  class UI

    def initialize
      require 'io/console' # for on-key input
      @input_buffer = ""
      @_debug_frame = 0
      ui_run 1
    end

    def ui_refresh(ui)
      _drawing_bool = true
      #ui_render_view
      STDOUT.puts " ***** #{__FILE__} - " + @_debug_frame.to_s
      _drawing_bool = false
    end

    def ui_run argh
      #require 'pry'; binding.pry

      STDOUT.puts Thread.current.to_s + @_debug_frame.to_s
      _state_int = argh
      while _state_int == 1
        ui_refresh(0)
        @_debug_frame += 1

        #input?
        #ui_grab_input
        tmp = STDIN.getc
        puts tmp  + "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"

        sleep(0.1)
      end

    end # ui_run loop

    def ui_grab_input
      @input_buffer << $stdin.gets.chomp
      # _inp << STDIN.getch
      # exit(1) if _input_buffer.include? "\u0003"
      # puts "IN PUT !!!!! " + _inp
    end

  end # class UI

  # ...
end