Interesting... I've seen my plants do that somewhat, but not that many leaves at once... I'm sure it's fine - as mentioned, it looks to me like it's just reaching towards the light(s). With the cfls, you could even have them a little closer than 4 inches (if that's possible with your setup) due to the low heat given off by those lights... i'd say 2-3 inches away for maximum light...just a suggestion.

It looks very healthy and strong!

Here's a pic from my last grow - my bluecheese plant had a similar leaf-issue..

Marijuana Growing