I'd say yes they are a dark green for sure. not dark, dark, dark, but definately a dark green. And that actually explains it a lot better. they are clawing down..just the tipsno, it's not normal. The leaves shouldn't curl down. Are your leaves a dark green, are they clawing down?
I think I have this problem. What do you do about it? Ease up on nutes or is it to late?Sorry for my english, and in addtion I'm stoned.
Those leaves you are talking about are "sinks", they are collecting nutrients and does not easily eat themselves (different from fan-leaves).
I guess you gave too much N going into flower, and those "sink-leaves" are holding it - giving the famous N-clawing.