They look fine in the big picture but usually when the leaves curl its because too hott keep your temps down remember cooler temps produce tighter nugs I have mine at about 73 allday
to me it just looks like your lights are buring the tips of your leaves. in the bigger picture they look fairly healthy. could also be some of the leaves dying off since it is flowering. overall, I'd say its nothing to worry about!
i think it's normal for that to happen during flower...the plant concentrates more on bud production, so it takes in nutes more for the flowers than the leaves...so, the leaves do suffer a bit