Clone of Clone mutation?

Ok everyone some feedback would be nice. I planted a Dinafem Sweet Deep Grapefruit feminized seed and took a clone from that before flowering. I then took a clone of that clone. This second clone has about 6 nodes of three bladed fan leaves and is about 1.5 ft tall. The leaves on this plant have also dramatically changed in size and shape. They appear much more sativa like, long and slender. I know for certain that I am not confusing this with one of my other strains. Any idea whats going on here? I also have other 2nd generation clones that do not have these same characteristics.

Yes, there appears to be genetic wildcards that can show up in generations grown from clones of clones. (dominate and recessive genes, and mutation at work)
I have plants (3-4th generation) that have NEVER been around male plants that have a clone strain that is hermi, while other clones are all girl (again from the same mother plant) . While it is written (in the pot bible) that clones will be "just like the
mother plant," there are clones that grow tall fast, bushy and low, some have various #'s of leaves. Clones are NOT necessarily just like their mother as nurture and mutation are also a major factor involved here.
PS I also found that some clones (upon reaching veg state) are more sensitive to ferts. or process less water, have lighter or darker leaves, and even produce more of the desired effect than other clones (again from the same MP) even when the dirt/fert/light/temp/size of container.ect are all present in the same amounts.
I have yet to know if Humic Acid can cause mutations--something I'm researching at present.
Happy Trails... Roberoo

Roberoo thank you much sir +rep. Also, should I be concerned about these mutations if they dont cause my plants to hermi or some other obvious flaw.