Nature style bibliography feed numbers all entries as "1."
The numbering should be incremental, instead of:
1.Vreeman, D. J., Finnell, J. T. & Overhage, J. M. A rationale for parsimonious laboratory term mapping by frequency. AMIA Annu Symp Proc 771–775 (2007).at <http://www.ncbi.nlm.nih.gov/pubmed/18693941>
1.Grannis, S. & Vreeman, D. A vision of the journey ahead: using public health notifiable condition mapping to illustrate the need to maintain value sets. AMIA Annu Symp Proc 2010, 261–265 (2010).
1.Vreeman, D. J., Finnell, J. T. & Overhage, J. M. A rationale for parsimonious laboratory term mapping by frequency. AMIA Annu Symp Proc 771–775 (2007).at <http://www.ncbi.nlm.nih.gov/pubmed/18693941>
1.Grannis, S. & Vreeman, D. A vision of the journey ahead: using public health notifiable condition mapping to illustrate the need to maintain value sets. AMIA Annu Symp Proc 2010, 261–265 (2010).
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API questions should generally be posted to zotero-dev, but since you're here: are you using content=bib or format=bib? The former generates references individually, so it doesn't make sense for numberic styles. The latter should get this right.