Why does Round numbers of Leads under Campaigns is different compared to the numbers appearing when you're customizing your Playlist and clicking on the Times Called.

We are checking our Lead Health daily to ensure that we have good leads to dial. In the Campaign section, we will see the actual Lead Health of each list together with a Round number. We're assuming that the Round Number is the number of times it was dialed by the AI Dialer however when we go to Playlist section and filter the Campaign or the list to Times Called, the Round does not match. Why?