@YouTube @TeamYouTube my sister made a Chanel and has been uploading.But the other day she gain subscriber quickly and it went from 11 to 21.The next day it went back down to 11 and is on the 12.
Generally, it's normal to see fluctuations in your sub count because we want to make sure the numbers are 100% accurate, so we perform additional verification & spam reviews. Also, it's likely folks are subscribing & unsubscribing as well. More info: https://goo.gl/6B1Eb6