The bottle was turned wherein the label was facing the candle.
Look at the barcode on the lower picture, it was on the right side of the label.
Loot at the barcode on the lower edge left side now of the upper photo.
The barcode side is the only part of the label almost at the edge or side of the bottle that is really facing the camera while the brand or trademark was at the other side facing the candle.
Therefore the bottle's label was facing the candle making it like an Xray or See Trough shot thus appearing like a mirror image.