pistils turning dark early?

I have a rando bagseed flowering for 3 to 4 weeks and its pistils are already starting to change to orange and red. I know heat can burn them and cause this and that pollination can cause dark pistils. But i dont think thats it due to temps being averagd and the plant being solitary and showing no signs of herm. Also it isnt only near the light so that rules out heat. Is this normal or are they turning a little early?
 
Top