We need a lot more information in order to help determine the problem and what's causing it.
What strain is it?
Is it in Veg or Flower stage?
If in Veg, for how long?
If in Flower stage, For how long?
Indoor or outdoor?
Soil, Soilless or Hydro?
If soil/soilless, what is in your mix?
If soil/soilless, what size pot?
Size of grow space (LxWxH)?
Make and model of grow light?
Temperature in the environment?
Humidity in the environment?
PH of medium or reservoir?
How often are you watering?
Type and strength of nutrients used?
The strain Jack herer and it’s in the Veg stage day 23 today, and I’m growing it in soil and my PH is around 6.5-7. Watering it when the soil is soft and I’m using the FoxFarm grow big nutrients
@sam-s It kind of looks like a pH fluctuation issue. Do you measure the pH of the nutrient mix or soil runoff?
Will it still flower?
If it's a photoperiod plant and you changed the light cycle to 12/12 then yes it will flower.