Had this problem once, didn’t know how it happened, or how I stumbled upon the solution…
In the Info window, click in the RGBA area. Each time you click, it will change the way the range of values is evaluated and displayed (0.000 to 1.000, 0 to 100%, 0 to 255, etc ). When you get to setting that you prefer to work with, just leave it alone and when you go back to the color picker, RGB values should display as desired.