when the leaves are growing up, does the color vanish?
Sure the first thing coming to mind is sickness but,
If they are all outside, maybe fresh and cold night temperatures did it?
since the 15th of august, it is getting colder by night.
It has happened suddenly, so not welcome for our cannabis plant.
This would be the best case scenario.
Ok I'm not living on the west coast, nor in the usa, I dunno about weather there.
My two cents man.
Best to you
EDIT: maybe you got a super purple pheno, this would explain why some of your males are also doing it.
I got a pakistan chitral kush at home, it is very impressive to witness purple borning bud sites after only 2 and a half week in 12/12 schedule.
And your girl is just following the same exact behavior. she's looking very good to me, by the picture.
Just ideas in the "Best case scenario" situation [once again]