Why does reporting show a lot of clicks from one source in a short period of time?

In all likelihood, these are what are known as 'bot clicks' . When an email is received, some corporate firewalls will check all of the links on your email to ensure they are linking to a safe location before delivering the email to the intended recipient.

The act of the firewall checking the link is often impossible to distinguish from a real human click with complete certainty, as these firewalls get more complex, and therefore we include them all for you.