Repeated citations help

Hello! I continue to have a problem with repeated citations. When I cite a different article (Book Section) from the same book/anthology, EndNote X8 always regurgitates the complete bibliographical information without the short form. I have tried unchecking the box in repeated citations and looked at my Word settings, but there must be soemthing I am missing. I am no expert at playing around with these things, so any help you can give me would be very much appreciated.