a cookie is a small file wich is set on the computer of the customer who visits your site.
cookies can have different lifetimes, but if it is 3 months, than after 3 months they will not be linked to you anymore if they visit an affclub site for the first time if they already registered within the 3 months….nothing wrong…
but you do not need to change the links on your site every 3 months…. that has nothing to do with it….
hope this helps a bit