There can be multiple reasons behind this issue.
Here are the most common ones:
- Please note that the unique visitors we count will equal the number of Users in your Google Analytics account and not the number of Sessions
- Another reason: the Google Analytics Tracking code is not inserted to each and every page of your site where the popup can be shown. In this case the number of unique visitors counted by us will be higher.
If none of these answered your question, please contact us at firstname.lastname@example.org