Hi Tony,
Thanks for your reponse. Calling not so easy, as I don’t live in North America, so answers below.
What output style are you using in the document? APA 6th
What Reference Type are these references that show up with (Singer-songwriter) after the author name ? The example below is a generic type, but it happens with others too, e.g., multimedia application—here’s the script for it (sorry, don’t know what the technical term is—App Title. (Year). Rights Holder| (Version Version)| [Mobile application software]|. Retrieved from URL
Does the same thing happen with these references in a new document when using a different output style like Numbered? Yes it does, I tried with Numbered and APA 6th Sentence Style
Thanks 
CC