This is the most N deficient plant(still alive) ive seen in many years and thats why its so stunted for its age.
Next time use good coco for the medium and use veg hydro nutes from the start, first half strength then full.
Looks like mum wasnt very healthy. try using cloning powder, clean blade, medium wet not drenched allowed to dry a little between waterings, make sure the medium is packed tightly around the stem no gaps,.heat mat and temps 75-85.
Not ideal, some strains take a long time to re veg and the plant looses its structure and the buds aren't as good. If the clones were under 18 hours or more indoor (clone box or mother) then of course they will want to flower with the much shorter days and colder nights. Next time put the...