The format of your curly-brace citations are known as “temporary citations” and appear when Endnote’s “Instant Formatting” is turned off (intentionally or accidentally). The temporary citations display just the author name, year, and Endnote record number (which is a unique number assigned to each record entered into Endnote).
To turn on Instant Formatting go to the Endnote X7 section in the MS Word ribbon and just below the “Categorize References” click the pull down menu to select “Instant Formatting is on”. The formatted in-text citations and references should be automatically generated but if not click the “Update Citations and Bibliography” command.