Then I misunderstood your original posting. I think you are saying that the first image was from tuning into a SD channel and the second by tuning into the HD channel. That is not what I got from your posting originally.
Some networks are now using AFD and some cable locations have the equipment o understand AFD. AFD is a flag that lets video gear know if the video is SD upconvert or true 16:9. If SD upconvert, the cable SD channel's gear will center cut the HD. If the video is true 16:9, the video gear will letterbox the video.
IIRC, CBS does not use AFD and not all cable head ends are equipped to use it, so in those cases the HD video is always center-cut.
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