If you continue, it appears to keep stacking up the entries. Only way is to press the "Gear" icon to get a fresh copy of the page. I assume this is something due to AJAX subforms - but haven't debugged at all.
The multiple submits seemed that were caused by the $live = true parameter in CHtml::clientChange called by the ajaxsubmitbutton, I overidden it in SHtml and it seemed to work now. Please check the code from svn
it's almost but not quite fixed. Works ok to save a new Auth_item with non-empty [data] field. But if you edit an Auth_item with data, and change the data, it is redisplayed in the form in serialized form. For some reason I don't know, the AfterFind() is not working in this context. As soon as the Save button is pressed in Edit Auth_Item panel, after [data] is changed from existing value to new value, then the new value is redisplayed in serialized form.
I also fixed this in svn, please take a look