Question regarding clone to flower with zero veg time

I have decided to put a few rooted clones straight into flower along with my regular setup. The lights are 4 1/2 feet above them due to the much taller ladies they are sharing the room with. They are sharing a 4x4 space that a 1000w hps is lighting. Here is what I am confused about, 2 of the 7 have virtually no growth in the 3 weeks that they have been in there, but do not appear dead rather they are starting to show signs of flowering, but have not grown at all other then the 1 flower site at the top why is this? The other 5 that went straight to flower as rooted clones have all grown alot in 3 weeks and are showing alot more early flower sets. Just wanted to see if any of you guys had any advice.

Different strain?

no they are all the same

its been a few days and i do see.. growth? 1/2" 12.7 mm on one and half that on the other, the bud sites are still progressing equal to the others who are not vertically stunted.

I actually just harvested 4 small jillybeans I flowered from small clones. They were about 5" tall when I put them under 12/12. They ended up being 22-26" tall and all got just about 40 grams each plant. That was with 62 days of 12/12.

I have a 4x4 room and only using a 400w cooltube. There was 3 other full sized plants in there at time also.

roots.............

ridefixed thats a sweet outcome imo i put mine into 12/12 around the same heigth but there under 1k hps, hopefully i can get a pic today to show RIU the difference im seeing.

Well I finally got some photos up you guys can see the difference sorry it took so long for me to get them.

im telln u its the roots...............

I run atleast a week veg to help the roots out, ill throw in a 6" clone an it'll finish around 18" if it's kush, then closer to 24-30" if it's sativa

im not doubting what your saying woody33333 i just wanted to put the photos up and see if anyone else had any input.