I'm not quite sure if I'm completely understanding what you mean but, I think you're referring to the "traffic views" and "traffic to hubs" on this page: https://hubpages.com/my/earnings/trackers
(Let me know if I'm wrong)
Basically the traffic views means how many people have clicked that EXACT tracker link, whether they signed up or went on their merry way.
The traffic to hubs means the number of views each referral is getting. Say you referred Sarah and Emily who both signed up and each wrote two hubs and had a 500 views each on those hubs. Under your "traffic to hubs" it would say 1,000 as that is the total amount of traffic to those two user's hubs.
Remember that you only get a 10% share of impressions, so you would get 100 impressions in that example.