Why are there 2 Color Temperature tabs in the color selection list?

While using a Prolights ECL TWC fixture with my ColorSource 20 we are trying to adjust color temperature for an event. We select the fixture, open the color tab and 2 different color temperature selection appear. Selecting some of the temperature options does nothing. Selecting some other does seem to select a color temp but it does not seem to match what is indicated on the button selected. how do I find out how to properly use this tab for proper color temperature selection?