Abnormal first initial before last name in "Citation" output mode for journal articles

I am using the built-in APA 6th Edition reference style for the "Citation" output mode in Zotero for Firefox on Windows 7. Now and infrequently in the past, the citation output will include the author's first initials, sometimes twice as I recently found. This is what I get from "Copy to Clipboard":

(J. Heckman, Moon, Pinto, Savelyev, & Yavitz, 2010)
(J. J. Heckman, 2006)

This is what it should be instead:

(Heckman, Moon, Pinto, Savelyev, & Yavitz, 2010)
(Heckman, 2006)

Thank you!
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