Reference list replicates with each citation

Everytime I cite a new reference in the text the reference list (at the bottom of the document) replicates, resulting in a very long reference list with the same references included many times. How can I fix this?

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which version of word processor, endnote, and operating system. 

This is usually because of a corruption in a field.  First make a copy of the document and put in a safe place.  Then Unformat citations to temporary or unformatted citations.  Select all and remove field codes (select all and Ctrl+6 or ctrl+shift+F9) and  delete any residual bibliography. Finally, reformat or update citations and bibliography (turning CWYW/autoformat back on).  This usually repairs the document.  

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