Gemma

Hello I am fairly new to creating wax melts. I have made my first batch and I used 100g soy wax, 10% fragrance oil and dye. Colour is fine but I have noticed upon burning the melt is sending off like a vapour. I have also noticed it smells strongly for around 1hr and then it goes really weak (at a similar time the vapour goes). Where am I going wrong? Thank you 🙂