Visitors tab number not clear

Hello,

Thank you for the nice plugin!

I don’t understand the number completly.

For example, for today:

In the summary list
Human visitors: 57
Unique IP: 9

When I look in the chart of today. I see a green line and a blue line. On 14 hour I see 16 unique IPs. So why is the Unique IPs in the summury list at only 4?

I don’t understand it. Can someone explain?

Thank you!

Greetings,
Pieter

http://wordpress.org/extend/plugins/wp-slimstat/