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).

Another think you could look into is a carbohydrate supplement for your plants. There are tons of 'professional' products out there that provide extra carbohydrates for your plant, which can help with aromatic oil production (scents). Search up on molasses; it's a cheap and easy-to-find substitute for those 'professional' products.