it could be a handfull of things. your plant is probably stunted for some reason. you have to give more info such as lights used, light scedule, grow medium, temp range, watering scedule, feeding scedule, humidity, nutes beeing used, pruning if any was done, ect. any one or a mix these variables can be the reason. it can also just be part of the natural grow cycle... ie. plants go through growth spurts the same way humans do. YOU NEED TO LIST MORE INFO
