It's working as intended. The 1.1.3 firmware will mirror the LCD output on its HDMI. If you update your camera's firmware to 1.2.3 , and use a 1.2.3 ML build, which will give you clean HDMI output.
You will still have the zoomed in view on your external monitor in 3K mode (which you use for pulling focus), however, you can set it up so you depress the shutter button, and you will see a low framerate preview (that has proper framing!) in your camera's LCD.