References not in consecutive order in Vancouver

Hi,
I'm using Vancouver Style, so numbered citations, in my Word doc.
All was swell until I re-opened my document to continue working on it. Suddenly Zotero started counting newly added citations with 1 again instead of picking up at the last number I added. (So finished at citation 16, next time I add a new citation it is not 17, but 1 again...)
Anyone know how to fix this??
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