Chicago author-date style and "series" information

I began working on a paper today and was very pleased to see that the Chicago author-date style included the information from the "series" field in the bibliographic entry (though it still did not follow it up with the information in the "number" field). After getting up to about a dozen or so bibliographic records, however, the series information disappeared. I'm not just imagining this, am I? Has anyone else noticed a similar problem?

Thanks!

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