2160p and LG SuperHD TV?

I am trying to understand UHD and it`s resolution settings. I have my Ultimo 4k connected to my LG 4K TV through the HDMI cable. The image I use is latest Blackhole. Now if I set the resolution to 2160p on the Ultimo 4k, no matter what channel I`m viewing the LG TV shows the channel resolution as 2160p. If I change the resolution to 1080p it`s the same outcome, the LG TV shows the resolution as 1080p. Is this normal? The Ultimo 4K always shows the correct resolution of the channel being viewed in the info bar.