The leaves are beautiful, bright, green and strong. I've noticed this scent before when purchasing basil. What is it? It said it was sweet basil!
Is it possible for you to download a photo of the plant?
I can't seem to but it looks exactly like this:http://www.edenbrothers.com/store/italian_large_leaf_basil_seeds.html
It could be cinnamon basil, which does have a stronger flavor but looks just like regular basil (as does your photo).
It looks like Genovese basil.
Fresh basil can be surprisingly pungent. Did you try crumpling a leaf in your fingers and smelling it? Taste it too. Sometime the nose can fool you.
Thai basil is kind of spicy and sharply anisey. I wonder if there was a mix-up.
Sometimes when herbs mature, their flavor and scent can become sharper, more pungent. It is often the young leaves that have that "sweetness" we are familiar with. It may be that the large leaves are too mature.