Today time perks quantity was corrupted in the database. Later it was restored from the backup and rounds/puchases logs.
For about 6 hours (until it was fixed), all players who had any time perks, temporarily received 10 hours of them. The temporary hours were removed after the fix, but no one get negative amount. So some "lucky" players were able to use free powerups during this time.
I'm really sorry for the inconvenience.