This is only a 1.9 issue.
When a user manually creates an calndar event, he can select the type of event (user,course,site) this should ideally be stored in the "eventtype" column, which is not happening at the moment for 1.9.
Refer to the discussion here :-
http://tracker.moodle.org/browse/MDL-32431?focusedCommentId=155864&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-155864
Assigning it to Dan as suggested by Eloy.
Thanks