Thanks Tony.
The options you suggessted did not work BUT there was a reason why. I exported the references via a page in our online study notes. It turns out that export was what caused the issues. Today I went to our uni library page and entered each reading item and then exported to Endnote x9. These items are all cited perfectly with no oddities. A long process but I am glad I figured it out.
Thanks again for your help.
Tessa.