Team Calendars and Jira release dates

We are just starting to evaluate Team Calendars. One feature we are looking for was the importing of versions(releses) from JIRA where the start date and end date would be reflected in the Team Calendar. The problem I am seeing is that Team Calendar is only showing the release date and does not span to the start date. In Team Calendars when I go to view the release the start and end date are the same, while in JIRA they are not.

Am I doing something wrong in my setup?

Thanks