To reproduce:
1. Create a shuriken particle system and open the Color picker for start color
2. Select the HSV color input
3. First issue: try entering some values - sometimes they change to a wrong value, other times it just sets the value to 0
4. Second issue: change the color to green (or anything, but not red). In the Colors area, while picking the color move towards the bottom-left corner and you'll notice that the color switches to red

Note: seems to be an issue with shuriken color pickers only

Does not reproduce with Version 4.2.2f1