"Adjust a Scene" can't alter CT values after creation

I have scenes that I've previously created. The values in "Adjust a Scene" are fine, but if I go to change a value for a bulb that I want to use "CT" values, my cursor will only position itself at the beginning of the "Level" and "CT" values fields. I cannot type any data in there to alter the settings. What's strange, is that if I change it to "RGB" I AM able to change the values to allow for the color to change. But since I use "CT" values rather than "RGB", that doesn't do much for me.