Duplicate references in word

Hello please help!

attached is a file showing the problem.
Does anyone know how to solve this problem?
https://s3.amazonaws.com/zotero.org/images/forums/u7434487/0riaxpfmhk7w2wf1vdb2.jpg

Thank you,
CemĀ 
  • What is the style you are using? Is it in a new, empty document? Are you sure "Cao et al." are the same item in your library (and not duplicates)?
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