Incorrect order for short citations in Word

I'm using the Chicago reference list without bibliography style using the Word plugin. If I insert a citation to a work and then insert a second citation to the same work before the first citation, then the second citation is made the short citation. This formatting is the opposite of what should happen. For example, I get something like this:

1. Stampp, Peculiar Institution, 200. [This citation was inserted second.]
. . .
6. Kenneth Stampp, The Peculiar Institution (New York: Vintage Books, 1989), 132. [This citation was inserted first.]

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