Note: This can have a variety of causes.
Our system counts visitors automatically as they are directed to your site. It is possible for our count to differ from yours in a variety of circumstances. Some possibilities listed in this section are:

Your website went down.
Network difficulties
Use of an image, java or javascript counter
Use of a 3rd party counter.
Your website was overwhelmed.
Bandwidth, system or connection throttling by your ISP/Web Host. Bandwidth Limits
Other Errors