yea man im not sure why its like that.... i have a thread that i started on this grow in the outdoor section and it has all the info about these that i have..meaning how old they are and what strains i got..
i have alot of c-99 and appollo strains that are all female clones, that picture of the stem is one of my c-99 wich when i got it looked like this
they were picked off a flowering plant, i let them come back after being picked for a few days then i chopped the buds of and they responded nicely... im pretty sure that that picture i have if the stem is one of these girls growin up

... yours are lookin good to man, gongrats