Theme license – Mojo market place

Dear Support,
i have purchased the theme for the third time so far via mojo market place. when i login to my account at Mojo, i found a fourth theme. how come i have 4 theme licenses and i purchase only 3? is the fourth theme Free to use ? how can i check the license number in order to compare which theme is installed on which website:
here are the website that i used your theme on so far:
http://www.plexusinvest.com
http://www.golemuria.com
http://www.pontuspetroleum.com

Thank you for your support
Sal