Not to cause alarm but you might want to have a poke through your plants and look for male parts. Withering stigmas that early in flower can sometimes indicate that there is male pollen in the room from a hermaphrodite.
But don't panic, it's likely fine. Its just good to be prudent. It could be from other causes too like rough handling or spraying them with sprays.
Some Violator Kush to keep it frosty in here!