I've seen that too. It's called the clock is being set to the time on the central clock because I would assume all the clocks are connected.
Or Veeblefester sneaks around in the walls and manually changes the clocks to mess with his employees. No, what am I talking about? Veeblefester would never do that. He'd pay someone to sneak around in the walls and manually change the clocks to mess with his employees.