"Add Notification" screen moves radio button to next option after choosing "Group" radio and the group name in the group combo box

When I am in the "Add Notification" screen (http://<jira-site>/jira/secure/admin/AddNotification!default.jspa?schemeId=<xxx>):

1) I select the notifications in the list on the left side of the screen

2) I select "Group" to notify a group of the chosen events

3) I select a group name in the group combo box

The selection on the radio button moves from "Group" to the next option, "Single e-mail address"