Syncing creates duplicates

EndNote EndNote How To
1

I have EndNote 7.0.2.  When I sync, even though I have automatically discard duplicates checked, and appropriate check boxes switched on, I get tons of duplicates - right now I have over 1000 duplicates yet again.  How can I stop this?  And is there an easy way to delete the duplicates without having to go through and click every one to delete? 

3

Thanks, Leanne - I will call support