System privacy settings on macOS can sometimes prevent Insightful from tracking which websites users have visited.
In such cases Insightful records only the browser used and not the specific visited websites (for example: what is reflected is only the time spent in Google Chrome browser but it is not divided by the time spent specifically on each and every website).
To get the website tracking enabled, you will need to set up the Automation permission on the needed devices accordingly. To learn how to do that please read this article.