What do you think could be the reason for this ?
lt would appear that the full colour never even had a chance to develop. The answer would be to improve mechanical mixing, checking on the type of dispersing agent used, and the amount, and checking the colour of your paint in relation to mixing time.
The paint’s flocculation behaviour could also be checked if the necessary experience and simple equipment are available, because flocculation can also cause a shift in colour. Here we would recommend the rub out test.