When viewing YouTube on the Clare + Ali channel not a single one of our videos has a thumbnail displayed... 

pic.twitter.com/ULcdg4R2yr
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Yup, @TeamYouTube is doing an experiment by making it so 0.3% of peoples thumbnails are auto generated. They’re trying to see if they can better them since they’re trash atm. They’ve issued a statement saying why it’s happening and but they didn’t notify the community at all