Erroneous duplicate bibliographies

I am typing a paper in WORD 2010 using Endnote X5.  Every time I add a reference to a paper, the complete bibliography is inserted again at the end of the paper so that I end up with multiple bibliographies.  I have never experienced this before in several other papers on the same computer and the same software.  Any one have any ideas what I need to do to correct the problem?

I have followed the instructions and done it twice but it keeps happening?

Word is version 15.39.17101000 2017

endnote cite while you write version 18.0.1.12093

Mac 0s Sierra version 10.12.6

I am working on a word document that saves to google drive, when I insert a reference into the main text using insert citation, it adds it into a duplicate list of references . No one else working on the document but I work on it from my computer at work but dont use endnote there. 

Any help much appreciated.

Claire

would have to check, not there until friday

Ok So I am using a MAC OS Sierra, version 10.12.4

Word is 2011 version 14.7.1(161129)

When I use endnote on other word documents its not happening only this one particular file/assignment.

Thanks Claire

Thanks for your help, I managed to get it done by manually putting in the references after the clean up.