Officially since January 10th 2017, pages where content is not easily accessible to a user on the transition from the Google mobile search results may not rank as highly.
This is an attempt of Google's efforts to secure a mobile-friendly experience for their users when executing search. They decide that interstitials on mobile make content less accessible to users, especially on the small screens of mobile devices. Intrusive popups are considered examples of such interstitials.
Thus, to help secure your site's Google ranking, especially on mobile search, we have changed the way Better Coupon Box presents on mobile devices. Instead of popups as before, Better Coupon Box now shows as a icon on the corner. When a customer click the icon, the popup will show normally.
Detailed information from Google's official announcement can be found >> HERE.