If you look at your reports in your affiliate networks and notice that you have more leads than clicks, or if you have many more leads one day than the previous with the exact same setup, you may wonder what is going on.  The main reason this is occuring is most likely this:

You may have been promoting an offer that says something like this:

“Payout occurs on confirmation page after user submits email and zip, and clicks on the link contained in the confirmation email.”

A user may enter in their email and zip one day, but not activate the link in their email for days.  Say you launch a campaign one day, and you notice you have many clicks with no conversions.  Then 24 hours later, you notice many conversions with the same number of clicks.  This is due to the delay in the user checking their email to confirm the offer.