Originally Posted by SmokeyTheBear

very simple explanation. cookies are not overwritten. if your friend visited someone else's link code in the month after they signed up thru you , they have someone else's cookie and thus they got paid for the signup not you. after 14 days your cookie is clear , if they visit someone elses link and get a cookie then they visit your ref code you wont get the credit.

if you want to do a true test tell them to type javascript:alert(document.cookie) in their address bar after they visit your link to ensure you are in the cookie