Not withered bro, maybe a little bit too much water or it's simply that you took the pics when the ladies are just plain tired and need a rest from the lights or they've had a rest and are looking forward to sunbathing
From what I read in your first post you have the lights off for 1/3 of the day or 8 hours, this might be a little bit too long in the dark for such young autos. Try 20/4 for a couple of weeks then you can get as low as 18/6 for flowering.
The different shades of colour on the leaves don't look like anything to worry about, just the plant growing fast makes the leaves change colour daily as different nutes get to different parts depending on the mood of your ladies.
That's my 2 cents anyway but if you are still worried get one of the more experienced guys to check them out in a couple of days :Sharing One: