Yeah very puzzling to most of us longtime photioshop users.
The correct panel or at least the way it was for many years since photoshop 3 anyway, was like below
photoshop 3.0.5 swatches panel
photoshop cs4 swatches panel
now in photoshop 2018 and since photoshop 2015
Some may say so what, but the real problem is for those with custom swatches like below where they don't line up at all and one has to redo them for the new versions and ask why did adobe even bother to change the panel in the first place.
It's even worse when one docks the swatches panel with other default panels instead of having it fly-out like in my screenshots.
Like the custom swatch color wheel from here
cs4 and correct
In photoshop cc 2018 and clearly not useful at all or even recognizable as the same swatches.
This issue should be fixed with the Photoshop CC 2018 (19.1.2) update which is now available.
Please install the update and let us know if you still see this issue.
To update, click Update next to Photoshop CC in the Creative Cloud desktop application.
If you don't see the update right away, click the 3 dots in the upper right and choose Check for App Updates.