I agree with NekoShema.
i would also like to add that some candles are manufactured by different materials.
For example, one candle can be made by (insert a name of a random chemical material) and the second one can be made (insert another name of a random material).
The burning of the candles depends on the materials they are manufactured by. One material is burnt faster, and one is burnt slower. Your candle might have been made by a material that burns extra fast.
Pay attention to this as well, you can read about the material the candles were made of in the back of the box.