I would need some additional information to assist.
What output style are you using in the document?
What Reference Type are these references that show up with (Singer-songwriter) after the author name ?
Does the same thing happen with these references in a new document when using a different output style like Numbered?
If you need a faster response you might want to contact Technical Support directly:
1-800-336-4474 option 4 then 1
or