Pay with a Like will not hold cookies.

I have Pay With A Like set for 120 hours for the validity of the like, so cookies should stay on user's computers for 120 hours. When I tested in Chrome and IE immediately after closing browsers and then reopening to look at articles I had previously liked, I could not access the articles without performing another like with different social media. I learned of this problem when the subject of an article informed me. Quite embarrassing. Do you know how to fix this problem? If not, I will NOT reactivate the program. Thoughts?