Clones - stunted growth

Am i being impatient, or is there something wrong with my clones? I have observed that they are only growing vertically, and they are growing REALLY slow. I cut the clones 7th january on a veggin plant, and they were rooted a week later. Im keeping the environmet in good ranges, and i have a proper quantum board, giving them 25000 lux.

Have given them 250 ppm of nutes, and i think they look overall happy, but how come are they not growing.

Do i have to be more patient growing clones? Im used to grow from seed, and they are growing a lot more explosively

They look good, sometimes there's a slow period for 1-3 weeks before they veg hard.

Theyre growing under the soil makin roots. Once a good system is formed they will grow fast