Purple haze mutated?

no just very small yet, looks like burned edges. maybe to much sun and she also short. You will see a more cannabis-like leaf-structure when the leaf gets bigger and the plant get older. First leaves look different

I don't see any problem with your girls.. Have some patient and keep waiting, your girls are going to become perfectly normal ! Have a good luck !

growdiaries.com/diaries/164016-grow-journal-by-asnoriu/week/913012 looks same as yours ? check weeks 3 and then 4. i tend to be not care with small pots and overwater them, but the second girl got bigger pot, all started flying. give her a week or so without watering, all should sort out. and have wet/dry cycle , its second most important thing in soil after watching pH.

Can't see any "mutations", can't see anything dreadfully wrong and can't see any reason to throw it away.

Not to worry.You see all sorts of mutants in cannabis,she''l come round fine in her own time.There's nothing wrong with mixing coco and soil in fact I believe its Canna that do it.I think they have 1 with around 30%.They'll all be like that in the UK soon as they're banning the use of peat.I ncant see where the logic is in 1 being able to be watered more than the other.Its going to dry out faster than the soil creating air pockets.I would of been more concerned about the cation exchange but if canna do it then who am I to argue.

This could also be insects, there is one black spot I can see in the middle of it that could cause this. Happened to me as well.

guess you are in soil mostly, despite mixing most stupid thing , aka coco and soil. thats pure sign of overwatering, soil needs wet/dry cycle, coco can be watered 4 times a day. why you went for such mix of polarities, i dont understand it and hate it.