The green indicators (dot) shows leads with interactions which came from the Fastbase script 5.0,
If you click on a WebLead with a green indicator you should see visitor interaction i.e. which pages were visited, the time spent, location of visitor, potential contacts to reach out to etc.

The orange indicators (dot) shows visitors reported from Google Analytics. Earlier all the leads were coming from your Google Analytics account but now you get leads from both Google Analytics and the WebLeads 5.0 Fastbase Script.  Visitor interaction requires some of the key data from Google Analytics which is discontinued by Google.

 

It is required to install the Web Leads 5.0 script to get the leads (green indicators) with visitors interaction details.