According to the tradition of China (or the experience left by people for thousands of years), during the period from the first day of July to June 15 of the lunar calendar, some negative substances will appear (we will use this word for the time being), and some children with special characteristics can even see real images. Some of these female materials are vicious and some are kind, but you meet the latter. Generally, you can't see your face, so it's normal. Don't be nervous.
Buddhism in China has a deep research on this, and you can learn more about it if you are interested.