You may want to investigate the possibilities of creating custom administrative views using the metadata tables available in the Workgroups Database
The following knowledgebase article may also be useful:
I agree that does seem odd and not what I would anticipate as well.
As Nathanael suggested, looking at the meta data in the workbook itself seems the best way. There isn't a way that I'm familiar with using the Tableau Server database
If you can repro this dependably (sounds like you can -- what version are you on?) I'd open up a tech support case and have them log this as a bug.