Over time, the fragrance in the upper layer of the candle evaporates. Naturally, therefore, this will give off less fragrance the first time it is burnt.
Generally speaking, the more liquid wax there is, the stronger the scent will be as it escapes more easily.
We advise you to wait until the wax surface has liquefied completely and to use your candle more so as to reach the wax with more concentrated fragrance.