This is not from experience just from research ( I have no life and read A LOT )
Most likely, it's just the strain you're growing. It is not abnormal for some strains to have little or no scent. When the buds have been harvested, dried, and cured, you will probably start to discern some smell (but maybe not as pungent as you'd like). I have also read that adding carbs ) mollasses and such can help with adding growth and oil production, hence smell.
~lady