It looks to me as if you arent leaving your lights off long enough, THC forms in the dark remember that. On your final harvest day, I would suggest leaving your plant in pitch black for 2 days ( 48hours ) wich will give your plants a heafty ammount of THC. You can also check the % of the THC will come from your bud off the site you bought it, if its low then yah your bud is coming out right, if its a high % ( 15-20 ) than I assume you didnt leave your plants in the dark for last dark period 48 hours.