There is some kind of "banding" in it. Does it happen when you color grade 8-bit footage?
The "banding" you are seeing is the levels of the three channels that make up a video signal. It isn't an 8-bit artifact. In the upper left and bottom scopes, the white/grey trace is the luminance channel and the others are the color difference channels. In the histogram in the upper right, you are seeing the white and RGB values.