Zotero adds author first names to in line citations, sometimes

Deleet
For some references, Zotero adds the first name to the in line citations. I can't figure out why. The name is formatted as [last, first] not as [first last]. There doesn't seem to be any difference between the references where it works correctly and where it doesn't.

Images showing the problem and the citation.
http://postimg.org/gallery/10a1we9go/34eafe17/

I have tried switching the style to Vancouver and switching back. Did not fix it.

Ideas?
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