that is genetics.

I recently revegged a bag seed grow and i got some strange leaves, like two fingered leaves and other strange ones. should be fine.

Window may not be the best light. Unless its outside u might as well just go buy a flourescant and create ur own lighting for it. U could add the flouro as an addition to the window light if u really want to keep the sunlight on it. Overall it's not too stretched looking, and it's branching nicely, but u could get it shorter and more compact.