It’s working as intended here that I can see. The values can still be checked against Photoshop.
Since in UE4 we use a slider range from 0-1 for our RGB range using 255*0.565 to get 144 for the Green 0-255 value. Then plugging in the requisite values for HSB gives the same output as UE4 in Photoshop.
This issue comes up often and the values that are there match Photoshop’s HEX Values which is really important. The two color sliders on the left are not going to always look exactly the same in color value because one is for the HSV and one is for the selected color. The Preview window for the color is what you should go by which matches up with everything else.