CMYK readouts

[mikemeister_admin]

When I'm in the wgCMYK space, the cmyk hue clocks - one in the curve panel and another pinned to the image, do not agree.  I set everything to working CMYK black.  Also the points on the curves do not agree with the clocks.
If I change to RGB space, then everything seems to agree.
Is this just me or a problem?

Not that I'm worried about it (!), I'm just trying to understand the cmyk space

[-default]

One explanation is that the sample sizes of the two are different.  The sample size of the hue clock in the curve window is set separately by clicking on the small arrow.  If the samples are the same size, the numbers are spot on on my system.