Yes.
All plants are individuals.
9 weeks is just an optimistic and very rough guide, based on optimum conditions and perfect cultivation and does not really apply to the real world, there are just too many variables when it comes to results. Things like temps, nutrition, light strength and amount, hydro or soil, genetic variation and the biggest, grower skill.
Never compare your grow to other peoples grows, there will always be someone with faster grows and bigger yields, just as there will also be people with lowers yields and slower grows, it all comes down to the environmental factors and genetics.
Each plant is a law unto itself, even 2 seeds from the same packet will have different needs and outcomes.
Seeds are unique, individual organic beings, not mass produced identical factory made copies of each other.
And you can't compare hydro and 10,000 watts of light with someone growing in their basement with cheap dirt and a nasty blurple light.
Each and every plant will be different, yours will get there, just keep up your current care regime and soon enough you will be able to harvest satisfying home grown buds that you did all with your own hands and with total control over quality!
Hang in there!
Cheers, Organoman.