I have an existing website which I added a landing page (Similar to how Groupon or deal site) where once a user launched the site, it will pop up this landing page asking user to subscribe newsletter.

However, once user click the close button to close the landing page, it will re-appear when user click on any link. I'm puzzled how come this landing page will re-appear a second time as it's irritating.

Please provide advice. Many thanks.