hey there, there are a million reasons why this can happen, mostly it's genetics, phenotype , environment and feeding. remember : every plant is different , and actually even inside the grow box there are micro climates and slight variations, also in the watering, one plant gets the "top water" one plant gets the "bottom water" and there will be a difference even like that. It's already on it's way i can see the pre flowering biomass forming, so it will take probably just a day or a few days more. It's always like that : once you're close you become impatient. Totally normal ! Hope this helps ! 🚀