Insert the same reference multi times

EndNote EndNote General
1

I am using endnote 7 and Microsoft office 2013, every time I insert a new reference, all the references I inserted will be insert one more time. If I format the the citation, all the references will be insert again.

Is anyone have the same problem?

How to solve this problem.

Thank you so much for your help.

2

Check this thread which is one of the shorter ones on this issue and points to  the knowledgebase article.