Why item goes for authentication without requesting it

[monamaha]

After shipping an item I got a message that it’s going to an authentication, not sure why or who requested it.. any feedback why this happened?? I have almost 109% positive feedback 

[disneyshopper]

If an item you have listed is in specific categories and prices, ebay places an Authentication Guarantee on the item.  When the item is paid for, you will receive a Fed Ex shipping label to send to the authenticator.  If it passes authentication, the item is sent onto the buyer.  If it does not pass, the buyer is refunded and the item is sent back to you.

https://www.ebay.com/help/selling/selling-tools/ebay-authenticity-guarantee?id=4644&st=3&pos=1&query...