A family of Microsoft word processing software products for creating web, email, and print documents.
Are there empty paragraphs between the citations? Click on the Show/Hide button (¶) so that you can see the formatting marks and remove any ¶ that appear on a line by themselves between the citations.
I am not familiar with how EndNote works, but possibly it inserts the citations in frames or textboxes.
If you google for EndNote Forums, you will find links to a number of discussion groups that deal specifically with EndNote and by asking in one or the other of those groups, you may find the information that you are seeking.