My adult gryphon, Everest, is showing up on my account as a baby. I've tried reloading, as well as signing out. It however, didn't change? Shes the only pet doing it, from what I've seen. So I'm not 100% sure if its a glitch or my own web browser doing it. I am on a Samsung Android and my browser was recently updated, which could entirely be the issue with it.

http://beastkeeper.com/pet/813325

Thank you for reporting! We restored the age of your pet. Unfortunately, it's not clear why this happenned. This was the only pet with such problem, and we failed to track what caused it. Sorry for the inconvenience.

Thank you. Things like this can happen, so no worries.