could easily be preflowers, cloning is (ideally) the most traumatic stress we induce on cannabis, its not uncommon for some strains to be practically unclonable, the rooted clones begin to flower due to stress. had this issue early on in my cloneing career with some bc hash plant, the mother was fine in vegging for almost 8 months but i could never produce a decent clone from her.
could also be hair like wax covering steams (normal)
or even hair like resin gland (also normal)
any way dont worry unless those hairs start to grow in large numbers, then you do have a flowering plant