I would say that was cut down about 4-6 weeks too early, or it had some difficulties during its bloom stage. At least you got something from your first grow.
I would suggest trying something leaning towards Indica for your next grow, they are shorter, tend to grow a little quicker, and during bloom they swell up in many short stages. Sativa's and Hazes tend to JUMP, they will do nothing for 2 weeks then suddenly swell, then do nothing for 2 weeks and swell again and so on. Which is why they are known for having much longer flowering periods.