Abnormal Growth Part 2

I am still having abnormal growth on my would-be Purple Kush mother. All the new leaves have only one finger on them, but the plant is growing fast and looks green and healthy for the most part. I'm using 4 300W equivalent CFL's so its not a lack of lumens, but I am just confused as to what could be causing this still. The roots are healthy and white and the plant looks like its thriving other than the single finger fan leaves. Any ideas? I want to clone her soon, but I don't want to clone theses single fingered mutants.

DWC
Been on 24/0 light, but I am switching to 18/6 after today to see if that helps
600 PPM (RO Water, Pure Blend Pro Grow Nutes (400 ppm), GroTek CalMax (200 PPM))
5.7 pH
67° Water
73-78° Air

my haley comet would give me one fingered leaves as she got older but she was fine had her for a couple of years till i moved on